Introduction
This document provides a brief summary of the activities carried out at the Coherentia-INFM R&D Center
from June 2004 to December 2005 and represents an integration to the Activity report 2002-2004.
The advances of the main Center research lines (A1-3) are first presented, followed by the reports
on the original “seed” activities that have been approved for continuation after the first two years (S2 and
S4), the tree new seed activities (SN1-3) selected by the international Scientific Council and the four
“esplorative“ activities (EX1-4) approved by the Executive Committee in October 2004. A list of the papers
published or submitted in the same period is also enclosed, as well as the list of the Lectures held at
Coherentia Center in Napoli.
During 2005 we have been experiencing uncertainties and difficulties due to the institutional changes
and the need to become fully integrated with the CNR (National Research Council) structure. This process
should be completed in 2006, and will imply a deep reconstruction of the full organization and management
structure. However the overall budget situation has been fairly stable in the last year (about 2.6 million euros,
not considering the salaries of the associated personnel and all building costs), and the foreseen budget for
2006 is also expected to be at the same level, guaranteeing the funding, at a reasonable level, of our
research efforts.
I am happy to say that in any case the level of scientific achievements of our Center has been fairly
high in 2005, keeping, or in some cases improving, the high standards of the first years. Internationally
recognized results have been obtained in the study of superconductors and strongly correlated oxides and in
the development of new devices also using and integrating ultrafast optical techniques.
In 2005, following the suggestions of the International Scientific Committee, we have held a number
of “internal” scientific meetings, including very successful workshops on Manganites, Optical Technologies,
Organic Materials for Electronics, and Superconductivity. We have also held a very stimulating meeting selforganized by our Post-Docs and young Researchers.
Among the most significant issues in the growth of Coherentia in 2005, let me emphasize the set up
of our laser ablation deposition system MODA, which, thanks to the efforts of the working team dedicated to
this important facility, is now fully operative. MODA will certainly act as an important reference point at
national and international level, bringing new research (and funding) opportunities.
Finally in 2005 an important Project on the physics and applications of oxides materials, named
“NANOXIDE”, lead by INFM (LAMIA and Coherentia) has been approved and funded by the European
Community (STREP Projects). Coherentia researchers have also organized an important meeting of the
European Science Fundation Project “PI-SHIFT” in 2005, underling the important role of our researchers in
this Project. Moreover the organization of the prestigious International Workshop on Oxide Electronics
(WOE13, October 8-11, 2006) has been assigned to Coherentia .This further underlines the increasing role
of Coherentia at an international level in the field .
Let me conclude by thanking the International Scientific Committee for the critical analyses and
stimulating suggestions, and all our researchers for their constant efforts.
Naples, December 31st, 2005
Prof. Ruggero Vaglio
Coherentia Director
MODA
A1: Deposition and diagnostics of thin films of innovative materials
Coordinator: F. Miletto Granozio
Our Activity assembles, at a national level, a substantial fraction of the expertise and instrumentation on the deposition
of high Tc superconductors and related transition metal oxides, plus a specific competence regarding the physics of
plasmas generated in physical vapour deposition processes. We aim at a) coordinating and comparing sample
fabrication activities and film growth studies performed by different PVD methods, b) coordinating collaborations for
sample characterisation, with peculiar focus on experiments held at large scale facilities, and c) providing to the Center
and in general to the national/international community innovative, high quality samples with certified properties.
Researchers
S. Amoruso, C. Aruta, G. Balestrino, R. Bruzzese, G. Ghiringhelli, L. Maritato, P. Medaglia, F. Miletto Granozio, M.
Salluzzo, U. Scotti di Uccio, A. Tebano, X. Wang,
M. Angeloni, N. Boggio; G. de Luca; A. Fragneto, A. Oropallo, P. Perna, M. Radovic, A. Sambri, M. Vitello.
Thin film growth at Coherentia-CNR-INFM
Research activity has been mainly focused on two kind of compounds: the superconducting cuprates, traditional field of
research of all the participating groups, and ferromagnetic manganites, which have rapidly reached a comparable
weight in our research. The interaction with other laboratories of the Center, in particular those participating to A3, has
further expanded the variety of analytical technique which have been employed on our samples. As cases of special
relevance, we would like to point out the increased effort towards magnetic characterizations - mostly boosted by
research on manganites - and towards experiments at large scale facilities.
Development of the new deposition and characterization
facility MODA.
The so called MODA system (Modular facility for Oxide
Deposition and Analysis) has been set up in all its major
components. The full system includes a) a fully software
controlled PLD chamber, equipped with a 6 target
carousel, a KF excimer laser, a high pressure RHEED, a
mass spectrometer, and suitable access flanges for
performing optical characterization of the sample and of
the laser plume; b) an analytical chamber equipped with
Fig. 1 - The new MODA Lab in Naples
an electron spectrometer and an X-ray source for XPS and
a spot profile analysis LEED (SPA-LEED), plus extra
flanges for adding further future characterization tools; c) a chamber for variable temperature STM/AFM; d) a
distribution chamber and a load lock chamber.
Thin film fabrication in MODA has started in late year 2005. Growth of high quality YBCO and LSMO films
by PLD has been immediately demonstrated. Grown samples of both compounds show very high critical temperatures,
a high degree of structural perfection, the rocking curves having FWHM < 0,1°, and good morphologies, with a tiypical
RMS of 0,2 nm measured on LSMO samples. XPS measurements on in-situ grown samples are routinely performed,
and provided until now a number of interesting preliminary results. The STM/AFM has demostrated the capability of
atomic resolution on simple materials (Si and HOPG), and of very clearly resolving the step structure on oxides.
Starting of the research on electron diffraction in MODA is foreseen in early year 2006. We will both employ the SPALEED, which is already partially working, and the high pressure RHEED, which will be presumably mounted in next
months. The integration in the MODA apparatus of a preexiting sputtering system is also under way.
Research on thin films of superconducting oxides
Resonant Inelastic X-ray Scattering (RIXS) and X-ray Absorption Spectroscopy (XAS) measurements were performed
in different samples of (BaCuO2+x)M/(CaCuO2)N superlattices, both at the Advanced Berkeley Light Source and at the
European Syncrothron Radiation Facility in Grenoble. The samples were formed by a charge transfer (CR) block
composed by two BaCuO2 layers and different infinite layer
nh ligand holes
0.32
(IL) blocks with different numbers of CaCuO2 layers. XAS
out-of-plane
in-plane
0.28
measurements were performed at different angle orientations
0.24
and polarizations, in order to obtain information on the
0.20
symmetry of unoccupied orbitals. XAS spectra showed the
0.16
transitions from the 3d9 and 3d9L initial state configurations.
0.12
The 3d9L configuration (where L stands for ligand) is related to
0.08
the hybridisation of Cu2+ with O-, therefore giving rise to the
-1
0
1
2
3
4
5
6
7
Ca blocks
Fig. 2 – Hole doping in a multilayer composed of two
BaCuO2 block and a variable number of CaCuO2 blocks
doping holes. The number of ligand holes is obtained by the
relative intensity of the 3d9L peak respect to the total intensity
of the 3d9 and 3d9L peaks. The results obtained both in-plane
and out-of-plane confirm the charge transfer interaction
between the blocks. Data analysis is still in progress, expecially on RIXS spectra.
The thickness effect on the superconducting-insulator (S-I) transition of epitaxial untwinned Nd1+xBa2-xCu3O7-d
epitaxial films deposited on SrTiO3 (100) has been analysed. Using high resolution x-ray diffraction and CuL and OK
edge polarized X-ray Absorption Spectroscopy we have at the same time studied the change of the electronic properties
and of the structure as a function of the thickness. Two structural transformations are observed. The first one is a
crossover from the orthorhombic and twinned structure, typical of thick samples, to a pseudotetragonal phase at
thickness lower than 60 unit cells. The second one, starting at a thickness lower than 20 unit cells and completing below
8 u.c., is assigned to a pseudotetragonal-tetragonal transition, and corresponds to a substantial decrease in Tc and in
hole doping. In particular a S-I transition is observed when the film thickness is reduced from 9 to 6 unit cells. While
the ab-plane unoccupied electronic states, associated to CuO_2 layers, are similar in 9 and 6 u.c films, we observed in
the insulating sample a large reduction of the chain oxygen O(1) 2px,y states together with a decrease of the Cu(1) and
Cu(2) out of plane 3d states and of the apical O(4) 2pz states. Our results suggest that the structural rearrangement and
the transport properties are explained by the ordering/disordering of the CuO chains. Moreover the relevant role of
holes present in layers adjacent to the CuO2 layers for the high critical temperature superconductivity has been
demonstrated.
Research on thin films of magnetic oxide
Activity in Naples was dedicated to the analysis of epitaxial strain and of its effect on the properties of fully strained
(100) and (110) oriented LSMO films, to the analysis of phase separation and to the fabrication of magnetoresistive
devices. The strain tensor was obtained by X-ray diffraction, and on the base of the elastic tensor the stress tensor was
calculated. The strain deformation of the LSMO cell grown on (110) STO substrates is particularly interesting, because
of the presence of a shear component. Furthermore, the
strain is anisotropic with respect to the in-plane directions.
This affects not only the magnetization cicles, as
demonstrated in last years, but also the resistivity itself, and
its temperature dependence, that can be also shown to be
anisotropic. As shown in fig. 3, the resistance vs. T
behaviour above the Curie temperature, measured along the
in plane [1-10] direction, is different, and this is attributed to
the peculiar kind of cell deformation taking place in such
Fig. 3 – R-T curves along the principal crystallographic
directions, for a (‘’1) and a (110) film, and along the
[1-10] direction of a (110) film are compared
direction, that leaves the bond lengths unchanged. The
research activity on phase separation and on the fabrication
of magnetoresistive devices has been performed in
collaboration with members of the other Activities, and will be described in the reports of Activity 3 and 2, respectively.
A careful study searching for conditions for low pressure growth of manganites in a PLD system was
performed in Rome. It has been shown that by decreasing
the fluence it is possible to optimise the oxidation process in
low background pressure, i.e. 10-4 - 10-3 mbar molecular
oxygen plus 12% ozone, allowing the in situ use of a
conventional Reflection High Energy Electron Diffraction
diagnostic. Films deposited at low fluence (corresponding to
a deposition rate per pulse of <10-2 unit cells per laser shot)
show a two-dimensional growth mode and possess
optimised magnetotransport properties without the necessity
of any further postgrowth annealing treatment. The
resistivity versus temperature measurements of LSMO films
grown at a rate of about about 300 laser pulses/unit, show
metallic behaviour with Tp as high as 370 K, comparable
with the values obtained for the best single crystals (fig. 4,
Fig. 4 - Tp for low pressure grown films as a
function of the pulse number/cell. Inset: R-T plots
as explained in text.
red plot). The fluence for such growths is only 0.3 J/cm2, just above the ablation threshold. Tp gradually decreases as the
deposition rate per pulse increases, and films grown at a deposition rate per pulse of 20 laser pulses/unit cell showed an
insulating behaviour (fig. 4, black plot).
To analyze the conducting/magnetic properties near the film/substrate interface in manganites, ultrathin films
(thickness <400Å) of La0.7Sr0.3MnO3 were epitaxially grown by Molecular Beam Epitaxy in Salerno. Structural,
magnetic and magneto-resistive properties were investigated. Highly anisotropic behavior in both transport and
magnetic properties were measured along the in-plane directions parallel to the substrate crystallographic axes. In
particular, the negative magneto-resistance measured at about 120K with the current along one of the crystallographic
direction, is larger than the room temperature colossal value. In the same low temperature range, with the current along
the other in-plane crystallographic direction (fig. 5), the magneto-resistance changes sign (resulting magnetic-field
independent for T~150K).
The low-temperature (<60K) transport properties of ultra-thin films have been investigated as a function of the
sample thickness (from 40 to 3.5 nm) and in the presence of an external magnetic field. With decreasing thickness, a
clear low temperature resistivity minimum slightly
affected by the application of the magnetic field has
2 50
2 00
been observed, and its presence has been possibly
1 50
Resistance (Ohm)
1 00
interpreted in terms of quantum interference effects.
As a function of the thickness, a cross-over from a
50
0
50
10 0
three-dimensional (3D) to a two-dimensional (2D)
15 0
Lsm o231s - thickness ~ 100Å
Zero Field Cooled
H = 1.0 Tesla
H = 3.5 Tesla
H = 7.0 Tesla
0
100
200
300
Tem perature (K)
Fig. 5 - Inversion from negative to positive magnetoresistance at
decreasing temperature
behaviour of the system takes place below 20 nm. A
re-entrant 3D behaviour is induced in ultra-thin films
by the application of large (> 2 T) magnetic field.
Plume analysis
The
research
activity
was
devoted
to
the
characterization of a LaMnO3 plume expansion in O2
with optical emission spectroscopy, ion probe diagnostics and fast photography, in order to correlate the plume
properties it with the properties of manganite films. Fast photography proved to be very effective, since it allows
snapshots of the plume propagation by recording images of its emission at different time delays with respect to the laser
pulse (see figure 6). We have been able to study the effect of the pressure on different interesting parameters, such as: i)
plume stopping length; ii) plume temporal broadening during the expansion; iii) asymptotic plume angular width.
a) at low background gas pressure (<10-2 mbar) the plume expands freely, resembling the plume expansion in high
vacuum
conditions;
b)
at
-2
intermediate pressures (≈10 1 mbar) the interaction with
the
background
gas
progressively influences the
plume
evidencing
propagation,
a
number
of
effects (change in the internal
structure of the plume and
formation of a double-peak
distribution of the emission;
Fig. 6 - Images of the LaMnO3 plume at an oxygen background pressure of 3×10
mbar. τ represents the time delay with respect to the laser pulse
-3
plume front braking and oscillating dynamics, followed by plume sharpening and stopping of the plume front; c) at
high pressure level (few mbar) the plume becomes very confined with a typical stopping distance of less than 1 cm.
In collaboration with Dr. J. Schou (OPL, Risø National Laboratory, Denmark) and Prof. J.G. Lunney (Trinity
College, Dublin, Ireland), the propagation of the plume produced by laser ablation of a silver target in different
background gases of different noble gases (He, Ne, Ar and Xe) was analyzed. The plume angular distribution broadens
for all gases except for a minor pressure range for the helium background gas, in which a distinct plume narrowing
occurs. The different expansion in helium background gas was ascribed to the collision dynamics in a helium plume.
This and other aspects of the process merits further investigations, and will be considered in the next future.
A2: Superconducting devices and fundamental issues in superconductivity under laser
irradiation
Coordinator: G. P. Pepe
Josephson junctions (JJs) represent a powerful tool both to study fundamental issues in condensed matter physics and to
envisage new original applications based on superconducting devices. JJs based on BCS-like low critical temperature
superconductors (LTS) and well established fabrication techniques, are the most appropriate to test new device concepts
such as those based on non-equilibrium effects. On the other hand, high critical temperature superconductors (HTS) JJs
may represent the 'desirable system' to study fundamental issues ranging from the unconventional order parameter
symmetry to quantum effects. One of the main aims of this activity is to investigate the effect of short and ultrashort (<
30 fs) optical laser pulses on both LTS and HTS superconducting systems trying to evidence effects related to induced
modifications of the superconductive properties. The capability of controlling laser pulses' characteristics is also an
important point of the proposed research. Moreover, fundamental studies on new coupled hetero-structures e.g.
superconductor-ferromagnet multilayers, aned the possibility they offer to control the phase difference between two
coupled superconductors in mesoscopic systems, represent another important challenging topic currently investigated in
the framework of this Activity.
Activity organization, laboratories and staff :
INFM Napoli
LTS based Josephson tunnel G.Peluso, G.P, Pepe,
junctions devices: theory and L.Parlato, R. Latempa,
experiment
N. Marrocco
HTS based grain
Josephson junctions
Ultrafast laser optical
spectroscopy
INFM Salerno
G.Costabile,
G.Carapella, V.
Granata, N.
Martucciello, F. Russo
INFM Roma
Other
partners
M. Casalboni, V.
Merlo, P.
Prosposito, M.
Cirillo, F. Stella
boundary A. Barone, F. Tafuri, D.
Stornaiuolo, D. Dalena
C. de Lisio, S. Solimeno,
A. Porzio,
Non-destructive testing using
SQUID magnetometry
Theoretical and computational
investigation
M.Valentino, C.
Bonavolontà, A. Ruosi
Tagliacozzo,
P.Lucignano, G.
Campagnano
G. Rotoli
(AQ)
Laboratories and equipments
The experiments performed within Activity 2 are mainly performed in the following laboratories:
Napoli
Low temperature JJs characterization (down to 0.3K);
MSA-H27
MSA-H21b
Napoli
Femto-s laser source for cryogenic device characterization;
MSA-1G23
Napoli
Materials for optics & Optoelectronics
ING-Peluso
Napoli
JJs characterization and cw laser irradiated test measurements;
SA-Costabile
Salerno
Fabrication and characterization of tunnel Josephson devices;
RM2-Casalboni
Roma
Preparation and characterization of sol-gel integrated optical waveguides.
Main equipments: Diode laser for Millennia system pumpin, Computer-controlled acquisition system for escape
measurements, Femto-Amperometer, Femtosecond Optical Parametric Amplifier.
Activity progress and main scientific results:
Nonequilibrium fast relaxation in proximised superconducting bilayers
The investigation of nonequiilibrium properties of superconductor-ferromagnet heterostructures has been continued
toward the development of a new detector experiment based on the fast bresponse of such hetero-structures. Part of the
scientific work within this topic has been devoted to the development of a new detector design based on Nb/NiCu
bilayers by following the approach of a strip-type detector: the schematic is proposed in Figure 1. The weak links have
been realized through a photolithographic approach for width down to 5μm, and a Focused Ion Beam etching for widths
less than 1μm. This latter configuration has been realized in collaboration with the Centro Ricerche FIAT, Torino, Italy.
Measurements are currently in progress at the University of Rochester, USA (Prof. R. Sobolewski).
Pump
Moreover, the investigation of the role of
Beam
Probe
Beam
nonequilibrium superconductivity on the electronDC
current bias
phonon cpupling in S/F hetero-structures is also
pursued: this approach is based on the assumption that
I
the e-ph constant λe-ph can be derived from the Allen
formula depending on the electronic constant γ, and
hence the electronic heat capacity, and the Eliashberg
Micro/nano bridge
S/F (NiCu/Nb)
electron-phonon coupling function α2F. A detailed
EO Crystal
transmission line
)
(LiTaO
Contact pad
study based also on the proximity model describing
these S/F hetero-structures is actually
under
Figure 1: Schematics of the S/F detection
development
configuration
3
The investigation of the interplay between
superconductivity and ferromagnetism has opened the
way for the development of novel researches named
“spintronics" due to the main role played by spins and
their control through the
spin injection and
accumulation, the investigation of the Giant Magneto
Resistance (GMR), etc. The application of such a
physics to ferromagnetic manganites in a heterostructure with a superconductor and insulator as
tunnelling barrier, represents an interesting step toward
the development of new concept spin-based devices.
In parallel, the fabrication and characterization of
conventional Al/AlOx/Co S-I-F type junctions have
been also pursued within the activity of the group of
the University of Salerno, for spin polarized tunnelling.
in zero field. A preliminary measurement is shown in
Figure 2 where a fit with a modified BTK model is also
reported.
Another interesting experiment which is currently
developed within the Activity A2 concerns the
investigation of the enhancement of the Josephson
critical current IC in S/F weak links when the
alternating F-layers forming the two electrodes are
anti-parallel aligned. The configuration is summarized
in S/F1/I/F2/S type tunnel junction where the F-layers
are obtained by changing the relative composition of
NiCu alloys. The multilayers are grown by electron
beam deposition, and processed by Focused Ion Beam
lithography. The magnetic state of the devices is
directly determined by measuring the current
perpendicular to plane (CPP) magneto-resistance (MR)
at high bias. Preliminary results show that IC is larger
when the F-layers are antiparallel aligned. The
maximum change of IC corresponds to the maximum
change of MR. Possible effects in the presence of small
Figure 2: IV and conductance curve of an Al-ICo tunnel junction. A BTK fit is also shown
magnetic fields, related to charging activation energy,
are also under investigation.
In Figure 3 a photograph of the realized device is
shown.
Figure 3: FIB image of a final device from 65°.
Advanced HTS JJs for fundamental studies and novel circuit implementation
The activity on HTS devices can be briefly outlined into two main projects. The former is addressed to study quantum
effects in high critical temperature superconductors Josephson junctions, and the latter to investigate vortex quantum
tunnelling in ultra-thin films characterized by vortices with extremely large Pearl lengths. In both projects the A2
Coherentia team (Napoli and Rome-Tor Vergata) had great benefits from the collaborations with international partners,
and in particular IBM T.J. Watson Research Center (USA) and Chalmers University (Sweden).
The YBaCuO grain boundary biepitaxial Josephson junctions have shown high values of the quality factor Q, crucial in
order to observe quantum behavior of Josephson junctions. In addition, the overall behavior of the biepitaxial junctions
has been proved to be dominated by d-wave induced effects allowing a unique possibility to combine the features of dwave order parameter symmetry with a remarkable tunnel-like behavior. In collaboration with the University of
Chalmers the junctions properties at very low temperatures have been measured providing an evidence of truly quantum
behavior. The first step has been to prove macroscopic quantum tunnelling with some evidence of effects induced by
the presence of a second harmonic. The second decisive step has been the demonstration of energy level quantization
through resonant activation. These results are of great relevance and represent one of the most advanced and promising
achievements in the field. They seem to indicate that the dissipation in a d-wave Josephson junction expected because
of the presence of low energy quasi-particles (that might prevent the occurrence of macroscopic quantum phenomena,
the key element for qubits) is low enough (hence allowing “sharp” energy levels, which is a major requirement for a
qubit). Several efforts on the Coherentia side are devoted to improve junctions properties, which might guarantee high
quality submicron devices. Some efforts include experimental and theoretical studies in the mesoscopic regime,
bridging the existing experimental gap between high temperature superconducting structures and nanophysics. The
fabrication process has been extended to LaAlO3 substrates in view of quantum measurements in presence of
microwaves.
The second project deals with dissipation in ultra-thin current-carrying superconducting bridges and with evidence for
quantum tunneling of Pearl vortices. Zero-field current-voltage (IV) measurements of artificially layered high-Tc
(CaBaCuO) thin-film bridges have been performed. The films are produced in Rome and patterned and measured in
Napoli (photolithography handling of superconducting monolayers is an interesting technological achievement, which
is also used for other experiments in Coherentia). Scanning SQUID microscopy of these films (realized by Dr. John
Kirtley at IBM) provides values for the Pearl lengths that exceed the bridge width, and shows that the current
distributions are uniform across the bridges. At high temperatures a thermally activated vortex motion is observed as
expected, while at low temperatures, the IV's are better fit by ln V linear in I-2. This is expected if the low temperature
dissipation is dominated by quantum tunneling of individual Pearl vortices. The extremely challenging objectives
proposed at the beginning have been realized, and now the group is ready for next steps, for instance the preparation of
the layout of the device for the measurement of Rabi oscillations, A fundamental role has been played by the prestigious
and functional collaborations mentioned above: these joint experiments are accelerating exchange between the various
groups and bridging Coherentia to very advanced topics on superconducting quantum devices.
Toward superconducting opto-electronics
The objective the A2 group at the University of Rome “Tor Vergata” has successfully realized chips
containing high quality Nb-based Josephson tunnel junctions coupled to waveguides operating at low temperatures,
connected directly to an external optical fiber. The aim is to produce a direct interface between a signal externally
travelling along the fiber to the first stage of the superconducting electronics. Moreover, this technique allows a direct
control of the impinging radiation position, a challenging issue in many fundamental experiments concerning the
interaction between any optical radiation and the superconducting matter.
In particular, a 3D structuring of the silicon substrate
has been obtained by wet chemical etching processes
with liquid reagents. The realized geometries are
isotropic U-shaped and V-shaped grooves. The starting
solution was a mixture of HNO3, HF, and CH3COOH
at different concentrations. The photoresist is not
compatible with such processes, and hence the
lithographic pattern must be realized on an artificial
mask. The best results have been obtained on NbN, and
dry etchings by Ion Gun have been settled up. The used
fiber for preliminary experiments was single mode with
a diameter of 127 μm, and a core 3÷6 μm. The angle of
the profile was 54.7 ° with respect to the wafer, and the
Fig. 4 Monomodal fiber ∅ = 127μm within the etched
width of the window for fiber allocation was 155μm in
grove
order to use the Si (111) planes as stop etching layer.
In Figure 4 a photograph of the allocated fiber is
shown.
Theoretical actitivty on mesoscopic physics
Resonant conduction through a Quantum Dot for correlation aong electron spins (Kondo effect). The electron
correlation plays a very important role in quantum dots characterized by a low transmission from contacts. Under these
conditions it can produce a Kondo effect with a conductivity equal to one at low temperatures even in the presence of an
insulating state at higher temperatures. In the case of open dots, it has been demonstrated that resonances in the
conductance curve can arise from the coupling between states localized within the QD: the role of the correlation can be
negligible in this case (Fano-type resonances ). A Fano-resonance can arise also from the presence of a continuum
spectrum of energies, which corresponds to a very spreaded Kondo resonance strongly coupled tolocalized states in
the QD. The investigation of such a possibility has been developed by noting that a similar mechanism can led to the
so-called “charge sensing”. This later will become a very important detection technique in the next future, and it
consists of the modification of the conductance by a “ Quantum Point Contact “, realized by the adding of charge to a
QD capacitively coupled..
Spin-orbit coupling in nanodevices and manipulation of spin by external e.m. fields. Recently, it has been demonstrated
that it is possible to manipulate the electron spin by means of electrical fields perpendicular to the device plane
(Rashba effect). The quantum interference of electrons moving balistically in an annular geometry has been studied by
using a Feynman-type approach. In the presence of strong magnetic fields, the spin of few electrons in a QD can be
totally polarized: this feature increases the importance of spin manipulation with a gate potential. By numerical methods
the coupling between the radiation and the QD has been investigated through the creation of a spin exciton.
Non-destructive testing by SQUID sensors on composite materials
(mm)
The high probability to damage composites material during their manufacture, service and maintenance, requires to test
the integrity of such structure and components using adequate predictive methods. Traditional Non Destructive
Evaluation (NDE) techniques are often not entirely adequate to detect subsurface flaws and delaminations inside fibre
reinforced plastic components, usually because of their limited spatial and depth resolution. An alternative to eddy
current sensor has been demonstrated to be represented by magnetic sensor such as a high-Tc SQUID. Thanks to its
high magnetic field sensitivity and its ability to work down to very low frequencies it can detect much deeper defects
and related effects.
The activity of the A2 group focused on measurements
75
on composite materials in the presence of impact at
60
different low energies. A proper post processing of data
45
has been also developed in order to produce an output
30
of the sensor which is comparable to the convectional
15
technique, e.g. ultrasounds and eddy Current with
0
0
10
20
30
40
50
induction coils. An example of such a similarity is
(mm)
proposed in Figure 5. Moreover, in order to
Figure 5 (a) magnetic map as detected by SQUID, (b)
demonstrate the sensitivity of the SQUID sensor, an
the result of the post-processing analysis, (c) an
imaging of a 4mm thick sample impacted at very low
ultrasound photograph.
energies (down to 0.18J) has been carried out.
Scientific Collaborations:
0,9
25,0
0,7
15,0
0,6
B(V)
module (pT)
0,8
20,0
10,0
impact at 12 J
impact at 20 J
impact at 36 J
5,0
0,0
-60
ƒ
0,5
0,4
0,3
0,2
0,1
-40
-20
0
mm
20
40
60
5
10
15
20 25
Energy
30
35
40
Figure 6 (a) Magnetic field along the impacted areas at
different energies; (b) the minimum of B as a function
of the impact emergy.
Experimental results demonstrate the possibility to
monitor the delamination between intralayers and
interlayers in advanced FGAs (Fiber-glass Aluminium)
composite, and to discriminate the impact damage even
in the presence of a permanent surface deformation.
The magnetic field as measured by a SQUID
magnetometer along a line scan over the impacted area
is shown in Figure 6. Moreover, the minimum value of
the magnetic field as a function of the impact energy
clearly evidence the presence of three energy regions
corresponding to only deformation, fractures of the
inner layer of FGA, and finally breaking of the rear
surface of the specimen, as expected in the case of
loaded composite materials’ analysis.
CNR Institute of Cybernetics, Naples: LTS JJs
fabrication on electro-optical substrates (LiNbO3 and
LiTaO3) and for junction modelling;
ƒ University of S. Luis de Potosi and South
Caroline University USA (Prof. B. Ivlev), Mexico:
nonequilibrium superconducitivty and quantum
physics
ƒ University of Twente NL (Prof. A. Golubov, H.
Rogalla): nonequilibrium superconductivity and
proximity effect in
superconductor/ferromagnet
hybrid heterosctructures and devices; development of
digital SQUID for advanced NDE testing.
ƒ University of Erlangen D (Prof. A. Ustinov):
quantum escape measurements in Josephson escape
measurements;
ƒ IBM T.J. Watson Research Center USA (Dr. J.
Kirtley) HTS device characterization
ƒ University of Chalmers, Sweden (Dr. F.
Lombardi): low temperature quantum measurements
on HTS systems;
CSNSM, Orsay, Paris F (Prof. M. Aprili): design and
realization of three terminal devices employing
superconductor/ferromagnetic structures.
A3: Fundamental issues in perovskitic oxides
Coordinator: Lorenzo Marrucci
This research activity is focused on theoretical and experimental investigations of perovskite oxides and other strongly
correlated electron systems. The main experimental approach is based on linear and nonlinear optical spectroscopies.
These optical techniques are however complemented by other electromagnetic spectroscopies, such as in the microwave
and x-ray domains, and by electronic techniques, such as STM or photoelectron spectroscopies. This research is mainly
aimed at understanding key fundamental issues, but with a long-term view on the potential applications of the
investigated materials in superconducting, optoelectronics and spintronics devices.
Researchers
Owing to its breadth of scientific goals and investigation methods, this activity is organized in the following four
overlapping research lines:
1) Infrared and Raman spectroscopy. Location: Roma I–La Sapienza and Trieste-ELETTRA. People: P.
Calvani, P. Dore, S. Lupi, A. Nucara, P. Postorino, D. Di Castro, M. Ortolani, A. Perucchi, A. Perla, A.
Sacchetti, M. C. Guidi, E. Arcangeletti, L. Baldassarre, M. Baldini, F. Crispoldi
2) Nonlinear optical spectroscopy. Location: Naples-MSA. People: L. Marrucci, D. Paparo, F. Miletto, U. Scotti
di Uccio, C. Manzo, A. Rubano, A. Savoia, A. Oropallo, P. Perna.
3) Transport properties, STM and microwave spectroscopies. Location: Naples-MSA and Naples-Engineering.
People: A. Andreone, R. Vaglio, M. Salluzzo, F. Miletto, U. Scotti di Uccio, A. Cassinese, R. Di Capua, G.
Lamura, M. Aurino, G. Cifariello, E. Di Gennaro, P. Orgiani, M. Giura, R. Fastampa, E. Silva.
4) Theory. Location: Naples-MSA, Roma II-Tor Vergata, Salerno. People: V. Cataudella, G. De Filippis, V.
Marigliano Ramaglia, A. A. Varlamov, C. A. Perroni, D. Bercioux, S. de Siena, F. Illuminati.
Activity progress and main scientific results
In the period covered by this report, from July 2004 to November 2005, the research work of this activity has gone
much as planned in the original workplan and is making good progress. We also have obtained many noteworthy
results. In the following, we present a selection of results and progresses, organized according to the four main lines
listed above. Please note that this is not intended as an exhaustive
presentation of all scientific results (refer to the publication list of
the whole Center for a complete list of results).
Infrared and Raman spectroscopy
One of the most interesting results of ours in the last year has been a
study of the temperature dependence of the IR spectral weight W of
La2-xSrxCuO4 (LASCO) obtained integrating the real part of the
optical conductivity from dc to some given frequency Ω [M.
Ortolani et al., PRL 94, 067002 (2005)]. This study has revealed a
temperature behavior of LASCO that obeys to the same simple law
W(Ω,T) = W0(Ω) − B(Ω)T2 followed by normal metals, such as gold
(see figure 1 on the side). However, the value of the coefficient B
taken at the plasma edge frequency was found to be much larger
than that expected from a simple metal behavior, and this clearly
indicates that two independent energy scales rule the electronic
Figure 1 – Cut-off frequency Ω and
temperature T behavior of the integrated
spectral weight W (see text) in gold and
LASCO at two different doping levels.
Further details are discussed in the text and
in the referenced paper.
behavior in LASCO. This double-energy-scale behavior is a strong hint of the presence of an important contribution of
electronic correlations. This idea was confirmed in our subsequent theoretical work [A. Toschi et al., PRL 95, 097002
(2005)], in which a Hubbard-model solved with a dynamical mean field theory approach has been used to predict a
behavior quite similar to that observed experimentally.
Another very important result obtained in September 2005 and still unpublished [S. Lupi et al., submitted], is the first
sub-terahertz IR spectroscopy of B-doped diamond. This experiment is pioneering both for the technique used, which
allowed the measurement of the reflectivity of diamond with an excellent signal-to-noise ratio well below 1 THz (33
cm−1), and for the samples (produced in the laboratory of Y. Takano at Tsukuba), which are the first diamond films with
a critical temperature well higher than 4.2 K. We measured both the optical gap and the London penetration depth and
we showed that B-doped diamond is a BCS superconductor.
Among other noteworthy results, we mention the following: (i) an infrared study on NaxCoO2 [S. Lupi et al., PRB 72,
024550 (2005)], which confirmed the existence of charge ordering for suitable doping values; (ii) a Raman and IR
spectroscopic study of SrMnO3 (a parent compound of the much studied LaxSr1-xMnO3) as a function of temperature,
which led us to identifying a novel structural transition
in this material [A. Sacchetti et al., PRB 72, 172407
(2005)]; (iii) a far-infrared study on pure, Al-doped
and neutron-irradiated MgB2 samples, which allowed
Adjustable aperture
Sample visualisation
Synchrotron
beam
us to investigate the conduction regime in the two
bands (σ and π), by measuring the reflectivity ratio
(Rsuper/Rnormal), and to measure the gap for the first time
with FIR measurements [M. Ortolani et al., PRB 71,
172508 (2005)].
Finally, in 2005 the new infrared synchrotron
beamline SISSI has been completed by our Coherentia
team located at ELETTRA (see figure 2 on the side).
Schwarzschild
Objectives
X-Y microstages
Adjustable aperture
Interferometer
White light
IR detector
Figure 2 – Schematic layout of Coherentia experimental
station at the SISSI IR beamline, ELETTRA.
The beamline has rapidly reached performances
comparable with those of similar devices, like that mounted on the ALS ring at Berkeley, and is now fully operative.
Once the optimization and calibration of the beamline will be completed, a 25% of the beamtime will be reserved to
Coherentia experiments.
Nonlinear optical spectroscopy
The new nonlinear optical apparatus for pump-probe coherent antistokes Raman spectroscopy (CARS) applied to
perovskitic films and crystals, completed in 2004, has been carefully tested and several small technical problems were
detected and solved. Figure 3 shows an example of one of our nonlinear CARS spectra of an YBCO film (close to
optimal doping) at room temperature. All the main Raman-active phonons are visible, together with other features
which we are currently trying to interpret [A. Rubano et al., unpublished results]. We emphasize that these resonances,
apparently similar to “ordinary” Raman scattering lines, are actually obtained by driving the vibrational excitation by
means of light itself, i.e., we do not rely on thermal or quantum agitation for excitation. This adds a possibility of
external control which, in turn, will allow
0.16
us to investigate the dynamics and the
coherence properties of the underlying
0.14
degrees of freedom, a kind of information
0.12
available
with
ordinary
Raman
spectroscopy.
Transport
properties,
STM
and
microwave spectroscopies
We
applied
STM
spectroscopy
to
investigating the electronic properties of
two materials, in the form of thin films:
MgB2 and La0.7Sr0.3MnO3 (LASMO). In
particular, in MgB2 we focused on
studying the role of disorder, in order to
investigate the mechanisms by which the
critical temperature in this material appears
Y
Cu2
0.1
arbitrary units
not
Ba
O2-O2
0.08
0.06
O2-O3
0.04
O4
0.02
0
-0.02
-0.04
0
100
200
300
400
500
600
700
-1
Raman Shift (cm )
Figure 3 – Coherent (nonlinear) Raman spectrum of an YBCO film (Tc =
85 K) at room temperature. These resonances are excited by a nonlinear
coupling to grating created by two input laser pulses having different
frequencies (one at 532 nm and the other set at the value given in the
figure).
to be so weakly sensitive to sample quality
[M. Iavarone et al., PRB 71, 214502 (2005)]. In the case of LASMO, our tunneling conductance maps showed the
presence of electronic inhomogeneities at room temperature, slightly below the metal-insulator transition, which
disappear at liquid nitrogen temperature and are not correlated
with topographic features [R. Di Capua et al., submitted].
Moreover, the observed features clearly exhibit two very different
spatial scales of the fluctuations, as shown in figure 4, as has been
also reported for other manganites. The underlying mechanism of
these fluctuations is still uncertain.
We applied also microwave spectroscopy to studying MgB2 films,
by measuring the two tone intermodulation distortion arising from
the material nonlinear impedence, with the aim of understanding
the influence of the two superconducting bands on the
electrodynamic nonlinear response [A. Andreone et al., IEEE
Trans. Appl. Supercond. 15, 3612 (2005) and G. Cifariello et al.,
Figure 4 – STM conductance map of a surface of
LASMO at room temperature, showing two-scales
strong spatial fluctuations (see also inset).
submitted]. It has been shown that these samples are not in a fully
clean limit. They present a higher level of intrinsic nonlinearities at
low temperature and low circulating power in comparison with conventional s- and d-wave superconductors like YBCO
and Nb respectively. Considering that the level of nonlinearity can be decreased changing the scattering rates in the two
bands with substitutional doping, the nonlinear response of this superconductor can be suitably tuned to make possible
the development of new passive superconducting devices. Moreover, a new microwave-domain inductive contactless
method has been developed for measuring the critical current density of a superconducting film, by working out a
detailed analytical model of the inducing and induced currents distribution [M. Aurino et al., J. Appl.Phys., in press].
Finally, in the last year, a new activity on the electrical
transport properties of hybrid organic-inorganic materials
of interest for the fabrication of non conventional
electronic and optoelectronic devices was started. In
particular, our attention has been focused on non
conventional
semiconductors,
where
an
organic
component is integrated with an inorganic framework, so
that the thermal stability and high crystalline order of the
inorganic part is combined with the properties of
Figure 5 – A possible layered structure of the organic-inorganic
hybrid materials we investigated (see text for details).
flexibility and easy processing of the organic compounds (see figure 5). More in detail, we started investigating the
family of perovskitic based compounds, composed of amines and metal haloids with composition (R-NH3)2MX4 and
CH3NH3MX3, where M is a bivalent metal, R a generic organic radical and X is an halogen. These materials have been
prepared in the form of thin films on solid substrates and contacted for measuring their transport properties and for
developing simple field-effect devices [A. Cassinese et al., unpublished work].
Theory
Many experimental works described in the previous sections have actually benefited from the collaboration with our
theoreticians. One such collaboration has been actually led by the theory group and has led to a detailed study of the
temperature behavior of the resistivity in manganite thin films. The main result of this study has been the identification
of an intriguing correlation between the amount of disorder present in the film and the temperature exponent in the
resistivity [S. Mercone et al., PRB 71, 064415 (2005)].
Other results are purely theoretical. Correlations in the Holstein-Hubbard model at half filling have been studied by
using a variational approach introduced by us [C. A. Perroni et al., PRB 71, 113107 (2005)]. The model is relevant for
cuprates and other strongly correlated electron-phonon systems. The research activity on the polaron physics, one of the
main research lines of our theory group, has continued focusing on more general el-ph interactions (long range effects)
relevant for one-dimensional systems like DNA and carbon nanotubes [C. A. Perroni et al., PRB 71, 054301 (2005) and
E. Piegari et al., Eur. Phys. J. B 44, 415 (2005)] and developing an original computational scheme for the Holstein
model [G. De Filippis et al., PRB 72, 014307 (2005)]. A recently started investigation of spin-dependent transport in
bidimensional heterostructures has also led to several interesting results. An electrical field, perpendicular to the plane
where the electrons are confined, gives rise to a magnetic field parallel to the plane that couples with the spin electronic
magnetic moment (Rashba effect). We have studied in particular networks of quantum wires, which exhibit peculiar
localization behavior due to spin interference effects [D. Bercioux et al., PRL 93, 056802 (2004) and PRB 72, 075305
(2005)], and proposed a new kind of spin-field-transistor device based on the electron spin double refraction effect
induced by Rashba spin-orbit coupling [D. Bercioux et al., Superlattices and Microstructures 37, 337 (2005)]. The
contribution of vortex anti-vortex pairs to the temperature-dependent heat capacity of a type-II superconductor has been
evaluated and found to be dominant in a wide range of temperatures below Tc [Y. N. Ovchinnikov and A. A. Varlamov,
PRL 94, 107007 (2005)]. Finally, it is worth mentioning the publication of the new monograph by A. I. Larkin and A.
A. Varlamov on the “Theory of fluctuations in superconductors”, Oxford University Press (2005).
S2: Femtosecond laser pulse interaction with solid targets and investigation of the
ablation plume.
Coordinator:
Salvatore Amoruso
Participants:
C. Altucci, G. Ausanio, R. Bruzzese, C. de Lisio, R. Velotta, M. Vitiello, X. Wang.
Coherentia collaborations:
Strong collaborations have been established with Activity 1 and Seed
“Characterization and applications of nanogranular films produced by femtosecond
laser ablation” (Main Investigator: Prof. L. Lanotte).
External collaborations:
Dr. Jørgen Schou, OPL, Risø National Laboratory, Roskilde (Denmark).
Prof. Petar Atanasov, Institute of Electronics, Bulgarian Academy of Sciences,
Sofia (Bulgaria).
Introduction
The present seed research activity deals with the interaction of ultrashort laser pulses with solid targets and the
investigation of the ablation plume. In the previous two years, the ≈100 fs, 1 mJ Ti:sapphire laser source facility of the
Coherentia R&D Center was used demonstrating some of the peculiar features of fs laser ablation [see e.g. ref. 1].
Among others, our experimental results indicated that ablation driven into vacuum by intense fs laser pulses offers a
practical route for generation and deposition of nanoparticles (NPs) of different materials [2,3]. This feature was
employed to produce nanogranular films of nickel with very peculiar magnetic properties [4].
At the end of year 2004, a new laser source was installed in the Coherentia Laser Laboratory. This laser source is a
compact, fully integrated ps/fs laser based on a Nd:glass, chirped pulse amplified system producing pulses of ≈1ps at
1055 nm and ≈200-300 fs at 527 nm. The new system allowed us to carry out investigations at two different pulse
durations and wavelengths, and also to compare the experimental results with those obtained with the ≈100 fs-800 nm
Ti:sapphire laser employed in the previous investigations.
x (mm)
0
0
5
10
15
τ=25ns
Scientific activity
a) Experimental characterization of ultrashort laser ablation. The properties of the
5
z (mm)
The research activity was carried out along the following lines:
10
material blow-off produced during ablation with laser pulses of different durations
(≈300 fs and ≈1 ps), and wavelengths (527 and 1055 nm) have been studied. A
15
thorough analysis has been carried out on silicon and nickel addressing two
0
x (mm)
0
5
10
15
τ=22.5μs
fundamental features of the ablation process, namely the vacuum expansion of the
Moreover, other materials were also investigated in the frame of the present
z (mm)
5
ablated material and the generation of nanoparticles of the target material.
10
collaborations (e.g., TbDyFe, Ag, Al). Fast photography and emission spectroscopy
allowed ascertaining the presence of a fast atomic plume component formed by
atoms and ions of the target material and a slow component of nanoparticles (see
Fig. 1). The atomic plume readily separates from the target, while the nanoparticles
15
Fig. 1: typical images of the
plume showing the expansion
of the atomic (upper layer) and
NPs (lower layer) components.
component remains in contact with the target surface for much longer times. The NPs size distributions have been
analyzed through AFM analysis of less than one layer deposits. Our results show that the most probable NPs radii
generally do not exceed 10 nm for Si and 15 nm for Ni, respectively. Moreover, the NPs size distributions are pretty
narrow, with ≈85% of the Si and Ni NPs having a radius below ≈20 nm. The comparison of the data with previous
results obtained with ≈100 fs Ti:sapphire laser pulses indicates that the properties characterizing the plume expansion
and the size distribution of the produced NPs are almost independent of the specific laser pulse duration and
wavelength, in the investigated range. This, in turn, suggests that these properties
can be considered as general features of the process which are specific of the
timescales involved in ultrashort laser heating and following material relaxation,
and almost independent of the specific material properties and of the laser pulse
characteristics [5].
b) Comparison of experimental data with MD simulations. Molecular Dynamics
simulations were performed to elucidate the mechanisms of matter relaxation
following ultrashort pulse laser irradiation. The main outcomes of the analysis are:
i) the presence in the produced plume of two different classes of particles, atoms
and nanoaggregates (see Fig. 2); ii) the nanoparticles are directly produced from the
irradiated material through phase explosion, and do not result from condensation
processes in the gas phase in the first stages of the plume evolution [6]. These
Fig. 2: Snapshot of an MD
simulation showing atoms and
NPs.
features are both in very good agreement with the results of our experimental analysis.
c) Deposition of nanogranular films of magnetic materials. Finally, several films of elemental (Ni, Fe, e.g.),
multicomponent (TbDyFe) as well as mixed systems (TbDyFe and Fe with different volume fractions of the two
constituents, e.g.) were produced in the frame of the collaboration with the seed activity “Characterization and
application of nanogranular magnetic films produced by femtosecond laser ablation.
Instrumentation development
A new ps/fs laser source with was installed in the Coherentia Laser Laboratory at the end of year 2004.
Summary and perspectives
The interaction of ultrashort laser pulses with solid targets and the ablation plume were studied both experimentally and
theoretically. Our results suggest that the production of NPs can be considered as general feature of ultrashort laser
pulse heating and following material relaxation, and almost independent of the specific material properties and of the
laser pulse characteristics. In the next future, the different aspects of the process will be furtherly analyzed. In
particular, we anticipate experiments on: i) other materials (dielectrics, e.g); ii) tailoring of the NPs size by using a
second laser pulse. The experimental characterization will be also extended in the UV, in the next future, by frequency
doubling the 527 nm laser pulse.
References
[1] INFM Research and Development Center Coherentia – Biennal Activity Report 2002-2004 (available at:
http://coherentia.infm.it/struttura.htm).
[2] S. Amoruso, R. Bruzzese, N. Spinelli, R. Velotta, M. Vitiello, and X. Wang, Europhys. Lett. 67, 404 (2004).
[3] S. Amoruso, G. Ausanio, R. Bruzzese, M. Vitiello, and X. Wang, Phys. Rev. B 71, 033406 (2005).
[4] G. Ausanio, A.C. Barone, V. Iannotti, L. Lanotte, S. Amoruso, R. Bruzzese, and M. Vitiello, Appl. Phys. Lett. 85, 4103 (2004).
[5] S. Amoruso, G. Ausanio, A.C. Barone, R. Bruzzese, L. Gragnaniello, M. Vitiello, and X. Wang, J. Phys. B 38, L329 (2005).
[6] S. Amoruso, R. Bruzzese, M. Vitiello, N.N. Nedialkov, and P.A. Atanasov, J. Appl. Phys. 98, 044907 (2005).
S4: Quantum systems and computing
Coordinator:
Francesco Tafuri
Participants:
Antonio Barone, Detlef Born, Virginia D'Auria, Pier Gianni Medaglia, Pasquale
Orgiani, Alberto Porzio, Salvatore Solimeno, Daniela Stornaiuolo
Coherentia collaborations:
Collaborations have been established with Activity 2 and 1.
External collaboration:
IBM T.J.Watson Research Center, Yorktown, NY (USA), Chalmers University of
Technology, Goteborg (Sweden), Ames Labs (USA), Università di Milano e Roma
I
Superconductivity
The activity can be briefly outlined into two main projects. The former is addressed to study quantum effects in high
critical temperature superconductors Josephson junctions and the latter to investigate vortex quantum tunnelling in
ultra-thin films characterized by vortices with extremely large Pearl lengths .
1)The YBaCuO grain boundary biepitaxial Josephson junctions have shown high values of the quality factor Q, which
revealed to be crucial in order to observe quantum behavior of Josephson junctions. In addition we have proved that the
overall behavior of the biepitaxial junctions is dominated by d-wave induced effects. We can therefore combine the
unique features of d-wave order parameter symmetry with a remarkable tunnel-like behavior. In collaboration with
Chalmers we have measured junctions properties at very low temperatures providing evidence of truly quantum
behavior. The first step has been to prove macroscopic quantum tunnelling with some evidence of effects induced by
the presence of a second harmonic. The second decisive step has been the demonstration of energy level quantization
through resonant activation. These results are of great relevance and represent one of the most advanced and promising
achievements in the field. They seem to indicate that the dissipation in a d-wave Josephson junction expected because
of the presence of low energy quasi-particles (that might prevent the occurrence of macroscopic quantum phenomena,
the key element for qubits) is low enough (hence allowing “sharp” energy levels, which is a major requirement for a
qubit). Several efforts on the Coherentia side are devoted to improve junctions properties, which might guarantee high
quality submicron devices. Some efforts include experimental and theoretical studies in the mesoscopic regime,
bridging the existing experimental gap between high temperature superconducting structures and nanophysics.
Magneto-conductance fluctuations are signatures of an intriguing coherent quantum diffusion, which may shed light on
the actual transport regimes for these types of junctions.
2) The second project deals with dissipation in ultra-thin current-carrying superconducting bridges and with evidence
for quantum tunneling of Pearl vortices. We have made zero-field current-voltage (IV) measurements of artificially
layered high-Tc (CaBaCuO) thin-film bridges. The films are produced in Rome and patterned and measured in Napoli
(photolithography handling of superconducting monolayers is an interesting technological achievement, which is also
used for other experiments in Coherentia). Scanning SQUID microscopy of these films provides values for the Pearl
lengths L that exceed the bridge width, and shows that the current distributions are uniform across the bridges. At high
temperatures and high currents the voltages follow the power law V proportional to In, with n=
2
0
/(8
2
kBT)+1, and
at high temperatures and low-currents the resistance is exponential in temperature, in good agreement with the
predictions for thermally activated vortex motion. At low temperatures, the IV's are better fit by ln V linear in I-2. This
is expected if the low temperature dissipation is dominated by quantum tunneling of individual Pearl vortices.
We have achieved the extremely challenging objectives proposed at the beginning, and we are ready for next steps, for
instance the preparation of the layout of the device for the measurement of Rabi oscillations, and further insights in key
topics such as dissipation and coherence in HTS Josephson junctions, and in quantum transport processes. We remind
that the merit in achieving several results cannot be disjointed from the prestigious and functional collaborations
mentioned above. We consider very positive the fact that these arguments are pushing to establish some tradition of low
noise measurements at ultra-low temperatures (limited to 300 mK at the moment) also in Napoli. It is fair to mention
that all economical support and basic instrumentation come from other Institutions and Projects (European Project
QUACS, PRIN, STINT Sweden-Italy collaboration, Second University of Napoli).
Optics Aims of the scientific program were: a) set-up of a frequency degenerate type-II below threshold OPO based on
PPKTP crystal; b) characterization of the bipartite entanglement of the generated modes by homodyne measurements.
a)
A type-II crystal, contrarily to a type-I device, allows the realisation of CV entanglement. A type-II crystal,
working at frequency degeneration while pumped @532 nm, was not commercially available and has been designed on
purpose for our experiment. It has been acquired from the RAICOL Crystals ltd (Israel). A first crystal was tested at the
beginning of 2005 and, unfortunately, it has shown an absorption higher than the expected so that it was not possible to
use it in the set-up. After some months, at the end of July, a new crystal with appropriate characteristics has been
delivered. Since then the apparatus has been set-up and the exact frequency degeneracy temperature (54°C) has been
determined and the temperature control for the crystal has been optimised so to obtain a stability of <1mK (RMS over
1h). At the moment the OPO is ready to operate.
b) Below threshold a type-II OPO, seeded with a weak beam @1064 nm, is able to generate two quantum correlated
modes. The modes are cross polarized and they form a bipartite entangled system so that the state of one of them can be
inferred by measuring the state of the other. At the same time their superposition is a squeezed state. Field quadratures
are the entangled variables.
To properly characterize this CV entangled system it is necessary to perform several homodyne measurements on the
field at the OPO output. In the experiment a homodyne detector already operating on the optical bench at the beginning
of the project will be employed. During the first months the homodyne has been used for completing the
characterization of the state at the output of type-I OPO previously operating in the laboratory. In particular two
experiments have been performed: the first concerning the analysis of the state properties with the OPO operating close
to the threshold, the second in which the radiation produced by the OPO has been used as a probe in absorption
measurements.
The first experiment has evidenced that the usual Langevin equation with constant coefficient is not sufficient for
describing the OPO dynamic close to threshold. In this situation residual fluctuations, namely laser noise and cavity
vibrations, play a significant role giving rise to a deviation of the output state from a Guassian one. This deviation has
been first evaluated experimentally and then a theoretical model that explains it has been developed (a paper on this
subject is ready to be submitted). The second experiment was triggered by the fact that a squeezed vacuum field is very
sensitive to losses while it consists of a very low average number of photons. The squeezed field become an interesting
candidate as a probe in all the situations where the material changes under intense photon fluxes (strongly non-linear
materials or samples whose structure may be altered). Moreover, the optimal strategy for entanglement characterization
via a single homodyne has been studied.While this seed project is dedicated to CV variables, the group is taking also
part to a preliminary experiment on discrete variables QC, under the leadership of Prof. C. De Lisio (Coherentia
Activity A2).
SN1: Characterisation and application of nanogranular magnetic films produced by
femtosecond laser ablation
Coordinator:
L. Lanotte
Partecipants:
G. Ausanio, V. Iannotti, S. Amoruso, R.. Bruzzese, M. Vitiello
Coherentia collaboration:
A1, S2
External collaboration:
P. Scardi, M D’Incau Department of Materials Engineering and Industrial
Technologies, University of Trento
Introduction
We have focused our investigations on structural and magnetic properties of nanogranular films obtained by pulsed
laser deposition with ultrashort pulses characterized by duration of some fraction of a picosecond, a technique dubbed
ultrashort PLD (uPLD).
Scientific Activity
The schematic representation of the uPLD deposition process is shown in Fig. 1.
Isolated nanoparticles (for deposition time shorter than 5 minutes) or
nanogranular thin films (for longer deposition times) are deposited onto a
suitable substrate hold parallel to the target at about 30 mm distance, and at room
temperature. Co-deposition of two or more materials, in nanoparticles form, can
be performed by using an ablation target formed by different materials (see Fig.
1, e.g.).
Not only the average particles radius D determined from the AFM
images of a surface parallel to the substrate plane, but also the particles profiles
in different cross sections orthogonal to the substrate plane has been considered
Fig. 1 Schematic representation of the
uPLD in the case of a co-deposition of a
target made by two different materials.
(through the average particles thickness d). This
deeper investigation shows clearly that all the
deposited particles present a typical shape, very
similar to an oblate ellipsoid. Moreover, the
ellipsoidal particles have the major cross section
preferentially oriented in a plane parallel to the
deposition substrate.
In particular, the results
indicate that the production of lentiform particles,
with thickness below 10 nm, can be reached [1].
The deposited films present unique magnetic
properties, and, in specific conditions, very high
Fig. 2 AFM images of the uPLD film surface and the corresponding
cross section profiles at an early formation stage: 360 s in the cases
(a) and after long deposition times: 3600 s in the cases (b).
remanence ratios (up to 0.7) accompanied to relatively low values of saturation and coercive fields can be obtained
(fig. 3). We have interpreted these results in terms of the nanoparticles shape and orientation anisotropy, and of the
occurrence of a thermally induced tensile stress anisotropy, which is a function of the nanoparticles size and is caused
by the specific fs laser deposition process [2].
In the case of multicomponent nanoparticles, the high
temperature/time gradients favour the formation of a disordered structure in the quasi-liquid nano-fragments ejected
from the target, and the preservation of an amorphous state during
1.0
the rapid solidification on the substrate. A proof of this process is
fact, unlike thin films produced by standard PLD X-ray diffraction,
0.5
M/Ms
provided by the study of the Terfenol-D films obtained by uPLD. In
uPLD films do not show a crystalline pattern. In specific conditions,
0.0
PLD1
PLD2
-0.5
exchange magnetic interactions can be activated among the
-1.0
-0.3
nanoparticles determining new interesting magnetic performances
-0.2
-0.1
derived from the mixing of the components magnetic properties. The
0.0
μ0H(T)
0.1
0.2
0.3
Fig. 3 Hystheresis curves of the nickel
nanogranular films. PLD1 D=45nm d=28nm;
PLD2 D=92nm d=66nm.
reported results were obtained by co-deposition of Fe and
Tb0.3Dy0.7Fe2 (Terfenol-D), using a multi-target as that shown in Fig.
1. It is very interesting that the macroscopic magnetization curves (are not simply the sum of two separate responses,
as expected if each magnetic component behaves separately. The
2.0
curves appear indeed as the response of a single magnetic
material originated from the mixture of the two components.
Terfenol100-X IronX
changing of the iron content, while the iron seams to facilitate
μ0M(T)
This is confirmed by the magnetic parameters: coercive field and
the saturation magnetization practically behave as deduced from
x=100
x=65
x=15
x=0
1.5
1.0
0.5
both saturation and remanence more than that expected from its
percentage increase. All this leads to the conclusion that
exchange interactions are effective in the nanogranular
composite films [4].
Summary and perspectives
0.0
0.0
0.1
0.2
0.3
0.4
0.5
μ0H(T)
Fig. 4 First magnetization curves of the
nanogranular films obtained by co-deposition of Fe
and Tb0.3Dy0.7Fe2 (Terfenol-D) by uPLD, for different
Fe contents.
This seed activity demonstrate that the ultra-short pulsed laser deposition is a practical route to produce nanogranular
films of different magnetic materials (mono- and multi-component), made of nanoparticles with oblate ellipsoidal shape
of controllable eccentricity, ranging from 1 to 10, major diameter of 40-100 nm and minor diameter as small as ≈10 nm.
The ellipsoidal particles composing the deposited films are characterized by a common orientation of the major cross
section parallel to the substrate plane. The magnetic properties of the nanogranular films can be tailored by controlling
the shape and size of the nanoparticles or by mixing different magnetic materials. Generally, the uPLD nanoparticles
have crystalline structure, but in the case of complex compositions they can be obtained in disordered state more easily
than by using standard PLD. Taking into consideration all the features of the uPLD technique used for the preparation
of nanogranular thin films, there are two very promising future trends: 1) production of films made by oblate ellipsoidal
shape nanoparticles with a thickness lower than 10 nm, characterized by Giant Hall effect or Giant Magnetoresistive
effects similar to those occurring in multi-layers; 2) production of thin films for application in cantilever devices, microsensors and micro-actuators.
References
[1] G. Ausanio, S. Amoruso, A. C. Barone, R. Bruzzese, V. Iannotti, L. Lanotte, M. Vitiello accepted for publication on Applied Surface Science
[2] G. Ausanio , A.C. Barone, V.Iannotti, L. Lanotte, S. Amoruso, R. Bruzzese, M. Vitiello Applied Physics Letters 85 (18), pp. 4103-4105 (2005)
[3] L. Lanotte, G. Ausanio, A.C. Barone, C. Hison, V. Iannotti, S. Amoruso, R. Bruzzese, M. Vitiello, P. Scardi, M. D’Incau invited at ANMM 2005,
accepted for publication on Journal of Optoelectronics and Advanced Materials
[4] G. Ausanio, A. C. Barone, V. Iannotti, P. Scardi, M. D’Incau, S. Amoruso, M. Vitiello and L. Lanotte accepted for publication on Nanotechnology
SN2: Fast Superconductive Optical Detectors
Coordinator:
Sergio Pagano
Participants:
Carolina Adamo, Vincenzo Boffa, Roberto Cristiano, Mikkel Ejrnaes, Emanuela
Esposito, Mikhail Lisitskiy, Luigi Maritato, Sergio Pagano, Loredana Parlato,
Gianpiero Pepe, David Perez de Lara
Coherentia collaborations:
Strong collaboration has been established with Activity 2.
External collaboration:
Enrico Pessina, Flavio Fontana, Optical Innovation Division, Pirelli Labs. Milano
Roberto Leoni, Maria Gabriella Castellano, Istituto di Fotonica e Nanotecnologie
del CNR, Roma, Italy
Antonio Vecchione, Supermat CNR, University of Salerno, Salerno, Italy
Introduction
This research program is oriented to the investigation of optical detectors with advanced performances. More
specifically, radiation detectors based on superconductive materials are investigated. The use of superconductors
allows to reach elevated sensitivity (up to single photons) and very fast response time (up to few ps). Aim of this project
is to investigate alternative solutions to current superconductive detectors (Superconductive Tunnel Junctions,
Transition Edge Sensors), which require an extremely low operating temperature (<0.1K) and are relatively slow (μs),
and in particular to study configurations based on ultra thin superconductive striplines called Superconductive Single
Photon Detectors (SSPD). Various detection mechanisms, such as superconductor to normal transition and the kinetic
inductance effects have been considered for the SSPD. Moreover, several geometrical configurations have been
designed and characterized in order to optimize area coverage, sensitivity and response time. The specific
superconductor to be employed depends on a number of material parameters, the most important being: critical
temperature, coherence length, magnetic penetration length and of course non-equilibrium relaxation times. The
expected performances, in terms of response time and operating temperature, exclude “standard” superconductors such
as Nb, Ta, Pb, Al in favour materials having higher Tc, such as NbN, NbTi, NbTiN, MgB2, YBCO. The extremely fast
response time achievable with the SSPD would optimally match a local processing of the generated signal with ultra
fast superconductive circuits. However, the state of the art technology for superconductive electronics is based on Nb.
Therefore specific solutions have been developed in order to abtain a compatible fabrication technology that could
allow the integration of the advanced detectors with fast superconductive processing circuits.
Scientific Description
1) Development of ultra thin NbN stripline detectors
The activity on NbN SSPD has been carried on mainly with the aim of developing a fabrication technology compatible
with the possible integration with other Nb-based circuits (e.g. Rapid Single Flux Quantum logic). This has been
achieved developing a reactive dc sputtering room temperature deposition process that could allow the fabrication of
high quality ultra thin NbN films. This is particularly important as typically good NbN films are produced by reactive
sputtering on sapphire substrates at high temperatures (600-800°C). We have realized various films on different
substrates, finding the best properties for films on MgO substrates. The fabricated NbN films have thickness down to 10
nm, with a surface roughness of 0.1 nm, and are typically covered by a native Nb2O5 oxide layer of 3 nm, as measured
with low angle reflection x-ray analysis. Another important step for the realization of SSPD is the photolithographic
definition of the stripline geometry. We have developed two processes: one at CNR-ICIB for fabrication of micrometer
size striplines using standard UV lithography and based on a thin NbN sensor layer, a thick Nb contact layer and a thin
AlN passivation layer for the NbN, and one, in collaboration with CNR-IFN, for the fabrication of sub-micrometric
striplines using electron beam lithography and based on a thin NbN sensor layer and a thick Au contact layer. In Figure
1 a SEM photograph of one of the realized meander striplines is shown. The realized sensors have been tested using the
Low Temperature Laser Scanning Microscope (LTLSM) facility at CNR-ICIB showing a response time of about 0.5 ns
(limited by the readout electronics) and a sensitivity of few photons (500) per strip at a wavelength of 850 nm.
2) Development of ultra thin NbTi films
As alternative material NbTi offers some advantages over NbN:
a smaller coherence length (3 nm) and lower Tc. This would
allow the realization of thinner detectors (smaller volume) thus
boosting up the minimum energy sensitivity. However the
technological problem of realization of high quality ultra thin
NbTi films has to be solved. We have addressed this issue with
the Molecular Beam Epitaxy facility available at the University
of Salerno, using the atomic layer control achievable with this
technique to produce highly controlled and high quality ultraFig. 1 Meander type NbN SSPD. Each stripline is
thin films of NbTi. A number of NbxTiy thin films have been
100 nm wide with a filling factor 1:3
realized and their transport properties characterized.
3) Development of ultra fast pump probe measurements of detectors
Beside the demonstration of the feasibility of the fabrication processes for the SSPD, based on either NbN or NbTi, it is
very important to exploit the intrinsic physical mechanisms that govern the response to optical radiation in these
materials. In particular it is important to determine the various relaxation times involved in the complex nonequilibrium processes involved in the photon absorption and in the subsequent energy relaxation through mediated by
non-equilibrium phonons and quasiparticles. Given the extremely short times involved (ps) there are no electronic
measurement devices available. A very useful system to investigate this time domain is the Pump-Probe time resolved
spectroscopy facility available at the Coherentia labs. This facility has been upgraded to perform time resolved low
temperature reflectivity measurements on superconductive structures with a time resolution better than 1 ps.
Summary of obtained results and discussion on perspectives
The main results of first year of activity are: the development of a room temperature deposition technology for ultra thin
NbN films, the realization and dc and optical characterization of micrometer and submicrometer scale NbN detectors,
the setup and characterization of a pump probe system for cryogenic reflectivity measurements, the development of
MBE deposition technique and preliminary characterization of ultra thin films of NbTi.
The project activity will continue with the realization of detectors based on NbTi and their characterization at the
LTLSM. The NbN detectors will be further developed in the direction of integration with Nb based superconductive
electronics. In case of availability, through external collaborators, of ultra thin films made of higher Tc
superconductors, such as MgB2 and YBCO, stripline detectors will be fabricated and characterized. All the realized
detector structures will also be investigated with the cryogenic pump probe system.
SN3: Field Effect in ultra thin High Critical Temperature Superconducting Films
Coordinator:
Marco Salluzzo
Participants:
Antonio Cassinese, M. Barra, G. M. de Luca, A. Prigiobbo,
Francesco Tafuri, Daniela Stornaiuolo
Giuseppe Balestrino, Carmela Aruta, Pier Gianni Medaglia
Coherentia collaborations:
Strong collaborations have been established with Activity 1 and 3.
External collaboration:
Giacomo Ghiringhelli, CNR-INFM and Department of Physics, Politecnico di
Milano
Jean Marc Triscone, Université de Genève Département de Physique de la Matière
Condensée
Introduction
In modern MOSFET devices the electric field effect is used to modulate the conductivity of a thin semiconducting
channel. Substantial conductivity modulation, using practically accessible fields, can be obtained in materials that have
carrier densities lower than 1014 cm-2 . While ordinary metals are not feasible for field effect devices, substantial carrier
modulation can be induced in metal transition oxides materials, including the High Critical temperature
Superconductors (HTS). Since these strongly correlated materials are extremely sensitive to the number of carriers,
phase transitions can be in principle controlled by electrical field effect. The use of the electric field effect to modify the
density of carriers in a thin layer, equal to the Thomas-Fermi screening length λTF, of an HTS film is extremely
attractive for studying the electronic properties of HTS in function of doping.
In this project we will investigate field effect doping in two classes of HTS materials that can be good candidates for
such kind of applications: Nd1.2Ba1.8Cu3Oz (NdBCO) thin films and structures (M/N/M ). The main goal is to
demonstrate that it is possible to modify the critical temperature of HTS films by field effect. As possible objective we
will try to induce insulating-superconducting or metal-superconducting transition in these materials. As final goal we
will try to induce electric field modulation of the Josephson current in bi-crystal Josephson Junctions.
Scientific Description and summary of obtained results
Field effect devices are composed of a stacked multilayer structure as shown in Fig.1. In order to reduce as much as
possible complications in the fabrication process and in order to achieve
clean interfaces, in the first year of the project, in the case of the
(Ba0.9Nd0.1CuO2)M/(CaCuO2)N/(Ba0.9Nd0.1CuO2)M, we have fabricated FED
using the SrTiO3 (100) single crystal substrate as dielectric insulator. On the
contrary using a fully in situ fabrication technique, NdBCO FED have been
realized by depositing a thin Al2O3 layer on thin NdBCO films, and
Fig. 1: sketch of the FED device.
sequentially gold gates deposited both on the Al2O3 dielectric, both on the
back of the SrTiO3 single crystal. Using this configuration we were able to
use both dielectrics to induce the field effect and in principle we were able to investigate different interfaces.
In the fabrication process, a photolithographic step has been implemented for both structures. Geometries suitable for
the field effect have been tested, and a special cryogenic ion beam etching technique has been employed in order to
assure the minimum damage to the thin structures. M/N/M structures have been deposited using a pulsed laser
deposition technique. In order to reduce the number of carriers, a series of sample deposited at low oxygen partial
pressure have been grown. NdBCO FED have been realized using high oxygen pressure diode sputtering. During the
first year of the project we have deposited 3 to 6 unit cells structures. Depending on the thickness insulating (3 u.c.) and
superconducting (6 u.c.) films have been obtained.
Experimental results
In Fig.2 the comparison between the resistance modulation of 2 nm and 4 nm u.c. BaCuO2 (insulating) films and of 4
nm NdBCO in function of the gate voltage is shown. Form this results it is evident that screening in the BaCuO2 layer
is quite strong, since the resistivity modulation in a 4 nm structure is very small, while in NdBCO 4 nm film strong
modulation are achieved. This result is reflected in the negligible Tc shift observed in 5/2/5 and 5/3/5 structure. Indeed
due to screening by the (BaCuO2)5 layer, a small charge
induction on the CaCuO2 superconducting layer is
expected. However this result is still controversial. One of
the main complication in the interpretation of the field
effect in the 5/2/5 structure is associated to the difficulty to
discriminate effect on the CR(charge reservoir) BaCuO2
block from effects on the SC (Superconducting) CaCuO2
block. These effect can be also opposite in principle and
may explain a reduced electric field effect. On the contrary
Fig.2: resistance modulation by field effect
the results on NdBCO are encouraging as far as insulating
thin films are concerned, while again negligible shift of Tc
are seen in SC samples. In order to better interpret the experimental results, a direct correlation between the gate
voltage and the charge induced at the interface is needed. Capacitive vs voltage measurements have been implemented
and preliminary results suggest that traps at the interface, in the case of M/N/M structure, reduce considerably the low
temperature capacitance. This preliminary result gives another explanation of the reduced electric field effect observed
in the M/N/M structures.
Discussion and perspectives
The experimental results has given indication about the possibility to modulate the transport properties of NdBCO and
M/N/M structures. In the latter case the results indicates that a reduction of the thickness of the CR layer is needed in
order to directly influence the CaCuO2 layer. Moreover an interpretation of the results requires a study of electric field
effect on each layer separately. Finally an improvement of the film/substrate interface is necessary in order to reduce
charge trapping. This can be achieved by controlling the surface properties of the SrTiO3 single crystal. Suitable
chemical etching procedure and annealing in oxygen atmosphere will be used in order to assure a perfect STO/film
interface. Surface analysis technique, like STM/AFM, XPS and LEED will be used to check the properties of the STO
substrate before the deposition.
EX1: Lasing In Tunable Photonic Nano-Structures Based On Active Soft Materials
Coordinator:
Giancarlo Abbate
Participants:
Vladimir Tkachenko, Antigone Marino, Francesco Vita
External collaboration:
Diederik Wiersma, LENS – Florence – Complex Systems group and CNR-INFM
(IMM-Catania)
Giuseppe Strangi, CNR-INFM (Licryl) and Dipartimento di Fisica - Università della
Calabria, Physics of condensed matter group
Introduction
Photonic lasing materials range from fully ordered systems like photonic crystals to disordered materials that scatter
light diffusively. Novel laser sources based on soft-matter can potentially fulfil all of the scientific and technological
features required to such sources. Soft materials, namely polymers and liquid crystals (LC) are extremely promising for
the realization of photonic structures to be employed both as single devices or as part of innovative integrated systems.
In this seed we are investigating two different nano-structures to realize compact, tuneable mirror-less laser sources
operating in the visible: 1. disordered systems of liquid crystal droplets inside a polymer matrix, where scattering is
responsible for the lasing action, and 2. ordered systems like cholesterics liquid crystals that can be considered as a
photonic band-gap material. The most interesting aspect of these lasing systems is that optical and geometrical
parameters can be modified by applying weak external fields, hence resulting in a direct control of lasing features
(wavelength tunability, bandwidth, emission direction). Next step will be investigating quasi-periodic lasing structures.
Scientific Description
The propagation of optical waves in complex dielectric systems is an intriguing research subject. Complex dielectrics
are dielectric structures in which the refractive index varies over length scales comparable to the wavelength of light. In
disordered
materials
light
waves
undergo a multiple scattering process
and
are
subject
to
unexpected
interference effects like weak and
strong localization of light waves and
correlations in speckle fluctuations. On
the other extreme, periodic dielectric
structures behave as a crystal for light
waves.
Optical
amplification
in
complex dielectric structures can be
Figure 1
used to realize fascinating new light
sources. In a one-dimensional (1D)
periodic structure, laser action is expected at the photonic band edge, where the photon group velocity approaches zero.
Cholesteric liquid crystals are chiral nematics, where the handedness of the constituent molecules causes the orientation
of the local nematic director to vary in space. The result is a self-organized helical structure that is.
a 1D periodic structure, hence a 1D photonic bandgap is formed. When a fluorescent dye is dissolved in the cholesteric
host (see Figure 1a), laser action is observed at the edge of the band above a threshold (see Figure 1b). In particular we
studied the threshold dependence from the sample thickness and from the dye concentration [1]. In random systems on
the other hand, multiple scattering is used as a trapping mechanism to obtain laser action. Random laser materials have
both a high degree of disorder and exhibit optical gain, leading to a random walk with optical gain. Such diffusive
random laser materials have several properties that resemble a regular laser: above threshold the spectrum narrows
down and the emission can show a spiking behavior. Diffusive random lasing has been observed in a variety of
materials including liquid crystals.
Summary of obtained results and discussion on
perspectives
The results of the Naples group concern the study of the
threshold dependence on dye concentration and cell
thickness
[1]
and
the
optical
and
morphological
characterization of the composite structures on which
lasing devices will be based. Two of these have been
Figure 2
deeply studied, namely Holographic Polymer Dispersed
Liquid Crystals (H-PDLC) and new materials known as
Policryps or Poliphem that are layered structures made by an alternate sequence of polymer slices and liquid crystal
films [2].
Important results towards the understanding of light propagation in quasi-crystals, in view of the realization of such
patterned lasing systems have been obtained by the associated LENS group in Florence [3].
An array of microlaser in cholesteric liquid crystal micro-channels in a Policryps structure has been firstly demonstrated
and realized by the associated group at Licryl lab in Cosenza [4]. A wide-band tuning capability has been also shown.
The collaborations and activities related to the present seed will be strengthened in the next year, when hopefully this
project will be also financially supported.
Instrumentation development
With the aim of performing a linear optical characterization of all the employed materials and of realized samples in the
whole spectral range from near UV to near IR (270-1700 nm) we have designed and realized a custom sample holder
for a VASE Spectroscopic Ellipsometer in order to execute measurements in guided configurations, also in association
with the half-leaky guided mode technique. A further improvement in order to obtain temperature control in the range
20°-220° with a resolution of 0.01° (Celsius degrees) has been designed and its implementation is ongoing.
References
[1] W. Cao, A. Marino, G. Abbate, P. Palffy-Muhoray, B. Taheri, Mol. Cryst and Liq. Cryst., 429 101-110 (2005)
[2] F. Vita, A. Marino, V. Tkachenko, D. E. Lucchetta, L.i Criante, F. Simoni, and G. Abbate “Near infrared
characterization and modeling of nanosized holographic-polymer dispersed liquid crystal”, Phys. Rev. E, 72, 011702
(2005)
[3] Ghulinyan, M.; Oton, C. J.; Negro, L. D.; Pavesi, L.; Sapienza, R.; Colocci, M.; Wiersma, D. S. Light pulse
propagation in Fibonacci quasicrystals, Phys. Rev. B 71: 94204 (2005)
[4] G. Strangi, V. Barna, R. Caputo, A. de Luca, C. Versace, N. Scaramuzza, C. Umeton, R. Bartolino, G. Price;
Physical Review Letters 94 063903 (2005).
EX2: Molecular dynamic modeling of complex polymeric systems
Coordinator :
Antonio Coniglio,
Main proponent group:
Mario Nicodemi, Annalisa Fierro, Lucilla de Arcangelis,
Emanuela Delgado, Tiziana Abete, Antonio de Candia
(Institution: INFM – Coherentia)
Other partecipant groups:
1) Antonio Sasso, Giuseppe Pesce, Sabato Fusco
(Institution: INFM – Coherentia)
2) Paolo Antonio Netti, Assunta Borzacchiello, Enrica De Rosa, Sabato Fusco
(Institution: Interdisciplinary Research Center in Biomaterials (CRIB),
Piazzale Tecchio 80, Napoli
Introduction
Complex systems, such as polymers or colloidal gel, possess structures at a mesoscopic level that determine their
macroscopic physical properties. The aim of the project is to model the structure and dynamic of polymeric systems at
mesoscopic scale to understand the role of those in determining and controlling the macroscopic properties. In details,
we model the sol-gel transition of polymeric systems and compare the model prediction to experimental results at
different measurements scale, (from nano to micro-metric), correlating the structure and dynamics of the systems to the
macroscopic physical properties. We study polymeric solutions of associative polymers and saccharidic polymers that
undergo to sol- gel transition by changing systems parameters , like temperature or concentration. We have studied
these systems both theoretically, by molecular dynamics or Monte Carlo simulations, and experimentally by optical
techniques.
Scientific Description
1) Measure of complex shear modulus with optical tweezers.
Most polymer solutions exhibit both viscous and elastic properties. The physical quantity commonly employed to
quantify the viscoelasticity of such solutions is the complex shear modulus G*(f). The most frequently used methods to
measure the shear modulus involve placing the samples with volumes of order milliliters in conventional rheometers.
The shear modulus is extracted from the relation between applied shear force and measured strain or vice versa.
Frequency response of such instruments is limited by mechanical inertia and can reach only few tens of Hz.
Recently, several techniques, called microrheology have been developed to probe, on microscopic scales, the material
viscoelastic properties of systems. Motivations for miniaturization are: (i) Only small volumes of material, typically
microliters, are available. (ii) Inhomogeneities in the elastic properties of the polymer network on micrometer scales
can be explored. (iii)Microrheology readily allows for measuring viscoelasticity at higher frequencies, above 1 kHz or
even up to MHz, because inertia of both the probe and embedding medium can be neglected at such small length scales.
We have developed a passive microrheological technique based on optical tweezers. An optically trapped micrometric
bead (1 micrometer diameter) is used as a probe to explore the viscoelastic response of the fluid in which it is
embedded. The complex single-particle response function
(f)=
’(f)+i
’’(f) relates the Fourier transform x(f) of the
bead displacement x(t) to the Fourier transform F(f) of the force F(t) acting on the bead: x(f)= a(f)F(f).
The fluctuation-dissipation theorem provides the link between the single-sided Power Spectral Density (PSD) S(f) and
the imaginary part of the response function by
’(f) =( /2kbT) f S(f). A Kramers-Kronig relation has then been used to
calculate the real part of the response function, provided that
’(f) is known over a large enough frequency range.
Finally, from the generalized Stokes-Einstein relation the viscoelastic moduli G’ have been calculated.
We have first calibrated our apparatus by testing it with a known fluid (water). In this way we have characterized the
trap stiffness and the calibration factor of the position sensor (a quadrant photodiode in our case) used to monitor the x,
y and z coordinates of the trapped bead.
We have analyzed several complex fluids: hyaluronic acid solutions and CMC solutions at several concentrations (0.01,
0.05 and 0.1 mg/ml). The behaviours of G’ and G’’ and the viscosity have been obtained in a frequency range up to 10
kHz. These results have been compared with those obtained by Netti’s group finding a good agreement at low
frequencies, where these data are available with conventional rheometers.
2) Modeling of polymeric systems by Monte Carlo and molecular dynamics.
We have used Monte Carlo and molecular dynamics techniques to study the relation between the mesoscopic structure
and macroscopic properties of polymeric systems under investigations. The first model studied consists in monomers
occupying elementary cells of a cubic lattice, and therefore eight vertices of the lattice. Permanent bonds are randomly
quenched between monomers. The dynamic evolution of the system is based on the bond fluctuation dynamics, with
hard core interactions between monomers (i.e. two nearest neighbours monomers cannot have common sites).
Increasing the density of the system, the model undergoes a percolation transition, so that an infinite spanning cluster of
connected monomers appears. At this critical point, the viscosity of the system, which is proportional to the
autocorrelation time of density fluctuations, diverges, while a finite elastic modulus appears. If bonds between
monomers have a finite lifetime, then a drastic change in the dynamical behaviour is produced. The percolation
transition does not coincide with the divergence of relaxation times, but with a crossover to a different regime, where
the relaxation time is of the same order of the lifetime of the bonds. The results suggest that this could be a unifying
model to study the phenomenology of gelling systems, where bonds between monomers and hard core interactions play
the role of the attractive and repulsive part of the potential respectively. To study the dynamics of bond formation in
polymeric systems, we have modified the model in the following manner: monomers are linked by permanent bonds to
form chains of specified lenght. Moreover, specific sites of the chain can react with a different kind of molecules
diffusing in the system, that act as cross-linkers. We study therefore the dynamics of bond formation as a function of the
number of active sites on the chain, and the density of cross-linkers in the system. Moreover, we can study how the
structure of the formed network depends on these parameters, and how this structure influences the rheology of the
system. We plan to study the diffusivity of probes inside the polymeric network, as a function of the relative size of the
probe with respect to the mesh size of the network. These results will be then compared to the ones obtained
experimentally, as described in the previous section.
Many results of the model have been confirmed using molecular dynamic simulations. We simulate particles interacting
with a short range hard core repulsion, and a finitely extensible non-harmonic spring, that represents the chemical bond
between monomers. Molecular dynamics simulation are indeed more realistic, and allow to study the system also at
constant pressure, which is nearer to experimental conditions. Adding a long range repulsion between monomers, the
model is able to account for many features of different experimental systems, like colloidal systems or physical gels like
gelatin. The structures observed are surprisingly similar to the ones observed experimentally. At low density particles
form nearly spherical clusters, while at higher densities they form elongated tube-like structures, that due to defects in
the structure branch at a characteristic scale to form a disordered random network.
EX3: Size-Dependent Electron Confinement in Polymer-Embedded Metal and
Semiconducting Nanoparticles
Coordinator:
Pasqualino MADDALENA
Participants:
Corrado de Lisio
Giovanni Piero Pepe
N. Marrocco
Stefano Lettieri
Massimo Valentino
Coherentia collaborations:
Strong collaborations have been established with Activity 2.
External collaborations:
Gianfranco Carotenuto, Istituto per i Materiali Compositi e Biomedici (IMCB-CNR)
Napoli
Girolamo Di Francia, CRIF-ENEA, Portici (NA)
Antonio Parretta, ENEA, Bologna
L. De Stefano, Istituto Microelettronica e Microsistemi (IMM-CNR), Napoli
Introduction
Nanostructured materials are becoming one of the most important class of advanced functional materials and the
technology of their production and use is rapidly growing into a powerful industry. These fascinating materials whose
dimension is of just few nanometers include microclusters, nanotubes, nanoparticles, etc. It is clear that the number and
significance of new nanomaterials and application will grow explosively in the future.
The research interest in this field is principally devoted to the development of novel methods for the preparation and
characterization of polymeric nanocomposites materials in which the surface properties of metal and semiconductor
microclusters and their quantum-size effects are used to provide polymeric matrix of advanced functional
characteristics.
Thanks to the nanometric dimensions of the dispersed particles these new materials are characterized by several
peculiar properties:
-They have a high surface-to-volume ratio;-The small material crystallites (<10000 atoms) exhibit structure and
physical properties distinct from the corresponding bulk system;-Nanostructure electronic properties are size dependent
and quantum effects are relevant if the dimensions are smaller;-The electronic properties of the small crystallites can be
modified by surface chemical interaction;-Optical and transport properties will therefore be sensitive to the interactions
between the nanostructure surface and the gas environment.
It should be stressed, however, that some of the mechanisms underlying the physical properties are not completely clear
and assessed, so that basic research work is still required even if some possible applications of these materials in gas
and environmental sensing are under way.
Scientific Description and summary of obtained results
In this year we performed stationary photoluminescence (CW-PL) measurements on metal oxide nanostructured
samples such as nanobelts and nanowires. Thermal and optical properties of silicon
(crystalline, amorphous and porous) were also investigated in view of
3.5
3.0
300 K
Intensity (a.u.)
2.5
its applications in photovoltaic and gas sensing applications.
The samples were found to have strong CW-PL even at ambient
2.0
1.5
temperature (Fig. 1).
1.0
Measurements have been performed, at varying temperatures and
0.5
environmental
0.0
-0.5
400
500
600
700
conditions.
Photoluminescence
spectra
show
a
quenching when the sample is exposed to oxidizing gas such as NO2
800
λ (nm)
Fig. 1 Room temperature PL spectrum of ZnO
nanobelts
(Fig. 2). This can be expected when nanostructured materials are
considered, since they are characterized by a large specific surface.
The effect promotes the investigated nanostructures among the most interesting gas sensing base materials.
A Time Resolved PhotoLuminescence (TR-PL) apparatus has been set up in order to investigate the radiative and nonradiative contribution to the recombination process of the charge carriers.
Moreover, CW-PL measurements have been performed in natural
5x10
6
4x10
6
3x10
6
2x10
6
1x10
6
PL intensity (a.u.)
silica nanostructures, such as marine diatoms, showing their ability
to sense the surrounding gas presence: a PL quenching has been
observed in presence of electronegative molecule vapours (NO2,
Acetone, Ethanol) (Fig. 3), while an enhancement is observed in
presence of nucleophilic vapours (Xylene, Pyridine) (Fig. 4). The
280
533.4
1,5
Acetone
Ethanol
Air
400
538.1
440
480
557.1
Xylene
Pyridine
Air
15
533.4
1,2
P.L. (a.u.)
P.L. (a.u.)
20
NO2
1,8
360
Fig. 2 Quenching of the PL intensity of ZnO nanobelts in
NO2
Physics Research.
538.1
320
Temperature (K)
December 1, 2005 issue of the Virtual Journal of Biological
2,1
air
0
related paper, which appeared in APL, was also selected for the
2,4
NO2
(5 p.p.m.)
542.9
0,9
533.4
10
x5
0,6
5
0,3
0,0
420
450
480
510
540
570
600
630
660
690
Wavelength (nm)
Fig. 3 Room temperature PL quenching of marine diatoms
0
420
450
480
510
540
570
600
630
660
690
Wavelength (nm)
Fig. 4 Room temperature PL enhancement of marine diatoms
EX4: Matrix Assisted Pulsed Laser Evaporation of organic films for biomedical
applications
Coordinator:
Luciano Vicari
Participants:
F. Bloisi, A. Cassinese, F. Chiarella, R. Papa, M. Zoncheddu
External collaboration:
L. E. Depero, E. Bontempi, R. Pedrazzani, P. Bergese, I. Alessandri, P. Colombi
(INSTM, Univ. Brescia, Brescia)
Introduction
Polymers and most biomaterials (i.e. both natural and synthetic materials that interface with living tissues or biological
fluids) are characterized by complex molecules having high molecular weight. They have a wide range of applications
in biomedical (antifouling treatment, surface treatment of nano-devices and drug delivery systems, cell/genomic
signalling micro-arrays, etc.) and in other (e.g. microelectronics, bioengineering, etc.) fields. Recently growing interest
is occurring around a novel laser deposition technique (MAPLE: Matrix Pulsed Laser Evaporation) especially well
suited for organic materials. Since the participant groups have large experience on optics, film deposition, biomaterials
and thin film analysis, we have decided to activate (without COHERENTIA funding contribution) a thin film deposition
system explicitly designed for MAPLE technique in order to use it for deposition of antifouling and other organic films
of biomedical interest with contribution of University of Brescia group for film characterization.
Instrumentation development
The main efforts in this first stage has been the development of a thin film deposition system explicitly designed for thin
film deposition using MAPLE technique. The target is a frozen matrix[1] of a dilute solution of the substance
(polymeric or organic compound) in a relatively volatile solvent. A laser beam (usually UV) is focused on the target.
Differently from traditional PLD (Pulsed Laser Deposition) technique, the majority of the laser energy is absorbed by
the solvent (and not by the solute) molecules and so the photochemical damage of organic/polymeric compound is
reduced. Volatile solvent is pumped away while organic/polymeric compound is deposited on the substrate surface.
During film deposition, plume can be analysed by optical (i.e. fast CCD, with system upgrade) or spectroscopic
techniques (LIBS: Laser Induced Breakdown Spectroscopy). Specific characteristics of our MAPLE system (see Table
below) are “in situ” target freezing (controlled atmosphere or vacuum), use of different (currently 355 nm, and 266 nm
with system upgrade) laser wavelength, (x,y) target movement (and consequent full target surface scanning).
Scientific Description
In biomedical applications several inorganic (e.g. metallic or ceramics) materials are used for use in the human body to
measure restore and improve physiologic functions (heart valves, synthetic blood-vessels, devices for controlled drug
delivery, etc.). Two relevant problems are biocompatibility and capability to be integrated into the biological
environment. Biofouling (i.e. the accumulation of proteins, cells and other biological materials on a surface) is one of
the causes of malfunctioning or failure of biomedical devices. Polyethylene glycol (PEG), i.e. polyethylene oxide
(PEO, –CH2CH2O–) with hydroxyl groups at each end, with degree of polymerisation usually ranging from 600 to
9000, is widely used for its high biocompatibility.
Recently it has been shown that PEG thin films can be deposited with MAPLE technique[2]. On the other end several
techniques have been tested in order to improve film adhesion to substrate. One of the most promising and interesting is
the use of a special proteins (e.g. DOPA or MEFP1) as functionalised end groups[3].
We plan to test improvement of film adhesion by testing different methods based on multiple MAPLE films deposition
or polymeric growth on MAPLE deposited film substrate.
Summary of obtained results and discussion on perspectives
First important result obtained is the realization (without COHERENTIA financial support) of a system explicitly
designed for film deposition using MAPLE technique, therefore having some advantages (e.g. controlled target
freezing, full target surface scanning) with respect to systems adapted to MAPLE deposition. The MAPLE system has
been tested and is now operating. It will be used, in next future, to deposit thin film for biofouling inhibition both in
single and multi-layers (e.g. PEG, MAPD/PEG, etc.) and test the effectiveness of depositions. A subsequent step,
subordinated to funding, will be MAPLE system improvement (e.g. FHG to operate at 266 nm, substrate masks, etc.).
References
[1] Cherisey D. B. et al. Chem. Rev. 103 (2003) 553-576
[2] Toftmann B. et al. Appl. Surf. Sci. 247 (2005) 211-216
[3] Dalsin J. L. et al. Materials today 9 (2005) 38-46 ; Dalsin J. L. et al. J. Am. Chem. Soc. 125 (2003) 4253-4258
A 1
International journals - Published and Submitted papers
1
2
3
4
5
6
7
8
S. G. Chiuzbian, G. Ghiringhelli, C. Dallera, M. Grioni, P. Amann, X. Wang, L. Braicovich, and L. Patthey,
“Localized Electronic Excitations in NiO Studied with Resonant Inelastic X-Ray Scattering at the Ni M
Threshold: Evidence of Spin Flip,” Phys. Rev. Lett. 95, 197402 (2005).
L. Braicovich, G. Ghiringhelli, A. Tagliaferri, G. van der Laan, E. Annese, and N.B. Brookes, “Femtosecond
dynamics in ferromagnetic metals investigated with soft x-ray resonant emission” Phys. Rev. Lett. 95 , 267402
(2005).
J. Minár, H. Ebert, C. De Nadai, N.B. Brookes, F. Venturini, G. Ghiringhelli, L. Chioncel, M. I. Katsnelson,
and A. I. Lichtenstein, “Experimental Observation and Theoretical Description of the Pure Fano Effect in the
Valence-Band Photoemission of Ferromagnets” Phys. Rev. Lett. 95, 166401 (2005).
M.W. Haverkort, Z. Hu, A. Tanaka, G. Ghiringhelli, H. Roth, M. Cwik, T. Lorenz, C. Schüßler-Langeheine, S.
V. Streltsov, A. S. Mylnikova, V. I. Anisimov, C. de Nadai, N. B. Brookes, H. H. Hsieh, H.-J. Lin, C. T. Chen,
T. Mizokawa, Y. Taguchi, Y. Tokura, D. I. Khomskii, and L. H. Tjeng, “Determination of the Orbital Moment
and Crystal-Field Splitting in LaTiO ” Phys. Rev. Lett. 94, 056401 (2005).
3
S. Mercone, C. A. Perroni, V. Cataudella, C. Adamo, M. Angeloni, C. Aruta, G. De Filippis, F. Miletto, A.
Oropallo, P. Perna, A. Y. Petrov, U. Scotti di Uccio, L. Maritato, “Transport properties in manganite thin
films”, Phys. Rev. B 71, 064415 (2005).
M. Finazzi, A. Brambilla, L. Duò, G. Ghiringhelli, M. Portalupi, F. Ciccacci, M. Zacchigna and M. Zangrando,
“Chemical effects at the buried NiO/Fe(100) interface” Phys. Rev. B 70, 235420 (2005).
M. Salluzzo, G. M. de Luca, D. Marrè, M. Putti, M. Tropeano, U. Scotti di Uccio and R. Vaglio, “Thickness
effect on the structure and superconductivity of Nd1.2Ba1.8Cu3Oz epitaxial films” Phys Rev B 72, 134521 (2005).
S. L. Prischepa, A. Angrisani Armenio, L. Maritato, V. N. Kushnir, S. Barbanera, “The influence of a
submicrometre antidot array on the vortex topology and the pinning mechanisms in layered superconductors”',
Sup. Sci. Tech. 18, 152, (2005).
9
V. N. Kushnir, S. L. Prischepa, C. Cirillo, M. L. Della Rocca, A. Angrisani, Armenio, L. Maritato, M. Salvato,
C. Attanasio, “Nucleation of Superconductivity in Finite Metallic Multilayers: Effect of the Simmetry'”,
European J. Phys B 41, 439, (2004)
10
G. Ghiringhelli, M. Matsubara, C. Dallera, F. Fracassi, R. Gusmeroli, A. Piazzalunga, A. Tagliaferri, N.B.
Brookes, A. Kotani, and L. Braicovich, “NiO as a test case for high resolution resonant inelastic soft x-ray
scattering”, Journal of Physics: Condensed Matter 17, 5397-5412 (2005)
11
S. Amoruso, R. Bruzzese, R. Velotta, N. Spinelli and X. Wang, “Characterization of LaMnO3 laser ablation in
oxygen by ion probe and optical emission spectroscopy”, Appl. Surf. Sci. 248, 45-49 (2005).
12
S. Amoruso, B. Toftmann, and J. Schou, “Broadening and attenuation of UV laser ablation plumes in
background gases”, Appl. Surf. Sci. 248, 323-328 (2005).
13
S. Amoruso, M. Angeloni, G. Balestrino, N. Boggio, R. Bruzzese, P.G. Medaglia, A. Tebano, M. Vitiello and X.
Wang, “A correlated study of laser produced plume expansion dynamics and thin film growth of manganates”,
Appl. Surf. Sci, 247, 64-70 (2005).
14
M. Angeloni, G. Balestrino, N. G. Boggio, P. G. Medaglia, P. Orgiani, A. Tebano (COHERENTIA-Inst.
Nazionale per la Fisica della Materia Dipt. di Ingegneria Meccanica Univ. di Roma Tor Vergata, Italy),
“Suppression of the metal-insulator transition temperature in thin La/sub 0.7/Sr/sub 0.3/MnO/sub 3/ films”.
Source: Journal of Applied Physics, v 96, n 11, 1 Dec. 2004, p 6387-92.
15
Fan Yang, R. Mafhoum, R. Karim, A. Tebano, G. Balestrino, V. G. Harris, C. Vittoria “Manganese ferrite
grown at the atomic scale, Xu Zuo” (Dept. of Electr. & Comput. Eng., Northeastern Univ., Boston, MA, USA)
Source: IEEE Transactions on Magnetics, v 40, n 4, pt.2, July 2004, p 2811-13.
16
P. Dore (Coherentia CNR-INFM, Dipartimento di Fisica, Universita La Sapienza), Postorino, A. Sacchetti, M.
Baldini, R. Giambelluca, M. Angeloni, G. Balestrino, “Raman measurements on thin films of the La0.7Sr
0.3MnO3 manganite: A probe of substrate-induced effects”. Source: European Physical Journal B, v 48, n 2,
November, 2005, p 255-258.
17
C. Aruta (Coherentia CNR-INFM, Dipartimento di Ingegneria Meccanica, Università di Roma TorVergata), M.
Angeloni, G. Balestrino, P. G. Medaglia, P. Orgiani, A. Tebano, J. Zegenhagen. “Synchrotron X-ray diffraction
study of SrRuO3/SrTiO 3/SrRuO3 nano-sized heterostructures grown by laser MBE”. Source: European
Physical Journal B, v 46, n 2, July, 2005, p 251-255.
18
V.Ferrando, P.Orgiani, A.Pogrebnyakov, J.Chen, Qi Li, J.M.Redwing, X.X.Xi, J.Giencke, C.B.Eom , Q.R.Feng,
J.Betts, C.Mielke, “High upper critical field and irreversibility field in MgB2 coated-conductor fibers” Applied
Physics Letter 87, 252509 (2005).
19
M. Iavarone, G. Karapetrov, A. Menzel, V. Komanicky, H. You, W. K. Kwok, P. Orgiani, V. Ferrando,
“Characterization of off-axis MgB2 epitaxial thin films for planar junctions”,X.X.Xi. Applied Physics Letter 87,
242506 (2005).
20
P.Orgiani, Y.Cui, A.V.Pogrebnyakov, J.M.Redwing, V.Vaithyanathan, D.G.Schlom, “Investigations of
MgB2/MgO and MgB2/AlN heterostructures for Josephson Devices” X.X.Xi, IEEE Transactions on Applied
Superconductivity 15, 228 (2005).
21
Y.Cui, J.E.Jones, A.Beckley, R.Donovan, D.Lishego, E.Maertz, A.V.Pogrebnyakov, P.Orgiani, J.M.Redwing,
“Degradation of MgB2 thin films in water” X.X.Xi, IEEE Transactions on Applied Superconductivity 15, 224
(2005).
International journals – Yet unpublished papers
1
P.Orgiani, A. Yu. Petrov, C. Adamo, C. Aruta, C. Barone, G. M. De Luca, A. Galdi, M. Polichetti, D. Zola, L.
Maritato, “In-plane anisotropy of transport properties in La0.7Sr0.3MnO3 ultra-thin films”. Appl. Phys. Lett.,
submitted
2
G. Ghiringhelli, M. Matsubara, C. Dallera, F. Fracassi, A. Tagliaferri, N.B. Brookes, A. Kotani, and L.
Braicovich, “Resonant inelastic x-ray scattering of MnO: L
edge measurements and assessment of their
2,3
interpretation” Phys. Rev. B in press (2005).
3
U. Scotti di Uccio, P. Perna, R. Di Capua, A. Oropallo, M. Salluzzo, and F. Miletto, “Strain in epitaxial
La0.7Sr0.3MnO3 films grown on (001) and (110) SrTiO3” Phys. Rev. B, submitted
4
L. Maritato, C. Adamo, C. Barone, G.M. De Luca, A. Galdi, P. Orgiani, A.Yu. Petrov, “Low-Temperature
Resistivity of La0.7Sr0.3MnO3 Ultra-thin Films: role of the Quantum Interference Effects”, Phys. Rev. B,
submitted
5
M. Angeloni, C. Aruta, G. Balestrino, N.G. Boggio, B. Davidson, P.G. Medaglia, A. Tebano, M. Baldini, D. Di Castro, P.
Postorino, P. Dore, A. Sidorenko, G. Allodi, R. De Renzi, “Preparation and characterization of LaMnO3 thin film grown by
pulsed Laser deposition”, J. Appl. Phys., submitted.
6
P. Dore, P. Postorino, A. Sacchetti, M. Baldini, R. Gianbelluca, M. Angeloni, G. Balestrino, “Raman measurements on thin
films of the La0.7Sr0..3MnO3 manganite: a direct probe of substrate induced effects”, Eur. Phys. J. B, in press.
7
S. Amoruso, A. Sambri, M. Vitiello, and X. Wang, “Propagation of LaMnO3 laser ablation plume in oxygen
gas”, Appl. Surf. Sci. in press.
8
U. Scotti di Uccio, B. Davidson, R. Di Capua, F. Miletto Granozio, G. Pepe, P. Perna, A. Ruotolo, M. Salluzzo,
J. All. “Effect of strain in LSMO epitaxial films with different crystallographic orientation”, Comp., submitted.
9
A.A. Sidorenko, G. Allodi, R. De Renzi, G. Balestrino and M. Angeloni “55Mn NMR and magnetisation studies
of La0.67Sr0.33MnO3 thin films”. In press on Phys. Rev. B
10
B. Freelon, A. Augustsson, J.-H. Guo, P. G. Medaglia, A. Tebano, and G. Balestrino “Electron Correlation and
Charge Transfer in Ba0 :9 Nd0 :1 CuO2 2 =CaCuO2 2 Superconducting Superlattices”. In press on Phys. Rev.
Lett.
Volumes
1
2
J. Schou, B. Toftmann, and S. Amoruso, “Pulsed laser deposition: from basic processes to film deposition”, in
Laser Physics and Applications – 13th International School on Quantum Electronics, Eds. P.A. Atanasov, S.V.
Gateva, L.A. Avramov, and. A.A. Serafetinides, Proceedings of SPIE vol. 5830, 1-10.
J. Schou, S. Amoruso and J. G. Lunney, PLUME DYNAMICS, in Laser Ablation and Its Applications, Edited
by C.R. Phypps (Springer), in press.
A 2
International journals - Published and Submitted papers
1
2
G. Carapella, F. Russo, R. Latempa, and G. Costabile, “Preparation and read-out of a Josephson vortex in a
double-well potentiall”, Phys. Rev. B 70, 092502 (2004).
G. Carapella, R. Latempa, F. Russo, and G. Costabile, EUCAS 2003 Proc., IOP series (2005).
3
4
5
6
7
8
9
R. Latempa, G. Carapella, G. Costabile, G. P. Pepe, L. Parlato, and A. Ruotolo, EUCAS 2003 Proc., IOP series
(2005).
F. Tafuri and J.R. Kirtley “High Tc Superconductor Weak Links”, Rep. Prog. Phys. 68, 2573 (2005).
T. Bauch, F. Lombardi, F. Tafuri, A. Barone, G. Rotoli, P. Delsing and T.Claeson, “Macroscopic Quantum
Tunneling in d-wave YBaCuO Josephson Junctions”, Phys. Rev. Lett. 94, 87003 (2005).
F. Tafuri, J.R. Kirtley, F. Lombardi, P.G. Medaglia, P. Orgiani and G. Balestrino, “Advances in high Tc grain
boundary junctions”, Fizika Nizkikh Temperatur 30, 785 (2004).
Barone, F. Lombardi, A. Monaco, E. Sarnelli, F. Tafuri, and G. Testa, “Effects of d-wave symmetry in high-TC
grain boundary Josephson junctions”, Phys. Stat. Sol. (b) 241, 1192 (2004).
F. Tafuri, F. Lombardi, T. Bauch, D. Stornaiuolo, D. Born, D. Dalena, A. Barone, G. Rotoli, P.G. Medaglia, P.
Orgiani, G. Balestrino, V. Kogan and J. R. Kirtley, “Quantum flavours in high-TC systems: Macroscopic and
Vortex Quantum Tunneling”, Physica C (2005).
R. Capozza, D. Giuliano, P. Lucignano, A. Tagliacozzo, “Quantum interference of electrons in a ring: tuning of
the geometrical phase”, Phys. Rev. Lett. 95, 226803 (2005).
10
P. Stefanski, A. Tagliacozzo, B. Bulka, “Charge dynamics effects in conductance through a semi-open
Quantum Dot”. Solid.State.Comm. 135, 314 (2005).
11
P. Stefanski, B. Bulka, A. Tagliacozzo, “Interplay of Kondo and Fano resonance in electronic transport in
nanostructures”. Acta Physica Polonica A108, 555 (2005).
12
P. Lucignano, B. Jouault, A. Tagliacozzo and B.L.Altshuler, “Rashba control for the spin excitation of a fully
spin polarized quantum dot”. Phys.Rev.B71,121310(R)(2005).
13
P. Lucignano, B. Jouault, A. Tagliacozzo “Crossover of a quantum dot with spin orbit interaction in a
high magnetic field to a quantum Hall ferromagnet”, HAIT Journal of Science and Engineering , 1, 601625 (2005).
14
P. Stefanski, A. Tagliacozzo, B. Bulka “Fano vs. Kondo resonances in a multilevel “Semi-Open” Quantum
Dot”. Phys.Rev.Lett. 93, 186805-1 (2004).
15
D. Giuliano, P. Lucignano, A. Tagliacozzo, “Manipulation of the spin electron in a quantum dot using a
magnetic field and voltage gates”, Materials Science-Poland, 22, 81- 495(2004).
16
P. Lucignano, G.Rotoli, E. Santamato, A.Tagliacozzo “Coherent response of a low T_c Josephson Junction
to an ultrafast laser pulse”. Phys.Rev.B 70,024520 (2004).
17
G. Campagnano, D.Giuliano, A.Naddeo, A.Tagliacozzo, “Josephson current in a quantum dot in the Kondo
regime connected to two superconductors”, Physica C 406,1-8 (2004).
18
D. Giuliano, A. Tagliacozzo “Hamiltonian theory of the strongly-coupled limit of the Kondo problem in the
overscreened case”, J. Phys. C:Condens. Matt.16, 6075-6098 (2004).
19
P. Lucignano, B. Jouault, A. Tagliacozzo, “Spin exciton in a quantum dot with spin-orbit coupling at high
magnetic fields”, Phys.Rev B69,045314 (2004).
20
M. P. Lisitskiy, C. Nappi, M. Ejrnaes, R. Cristiano, M. Huber, K. Rottler, J. Jochum, F. von Feilitzsch, and A.
Barone “X-ray energy spectrum measurements by an annular superconducting tunnel junction with trapped
magnetic flux quanta”, Appl. Phys. Lett. 84, Issue 26, pp. 5464-546 (2004).
21
C. Nappi, M. P. Lisitskiy, G. Rotoli, R. Cristiano, and A. Barone, “New Fluxon Resonant Mechanism in Annular
Josephson Tunnel Structures”, Phys. Rev. Lett. 93, 187001 (2004).
22
A. Barone, “The strong impact of the weak superconductivity”, J. of Supercond. 17, 585 (2004).
23
A. Barone, A. G. Kofman, G.Kurizki “Zeno and antiZeno effects in driven Josephson junctions: control of
macroscopic quantum tunnel” in “Decoerence, entaglement and information protection in complex quantum
systems” Kluver Amsterdam 2004.
24
G. P. Pepe, A. Ruotolo, L. Parlato, G. Peluso, G. Ausanio, G. Carapella and R. Latempa, “Nb/NiCu bilayers in
single and stacked superconductive tunnel junctions: preliminary results”, J. Magn. and Magn. Mat. 272 .276
(2004).
25
L. Parlato, G. P. Pepe, R. Latempa, C. De Lisio, C. Altucci, P. D’Acunto, G. Peluso, A. Barone, T. Taneda and
R. Sobolewski, “Time-resolved photoresponse of nanometer-thickness Nb/NiCu bilayers” Appl. Surf. Sci. 248,
177 (2005).
26
G. P. Pepe, L. Parlato, R. Latempa, P. D’Acunto, N. Marrocco, C. De Lisio, C Altucci, G. Peluso, A. Barone, T.
Taneda, and Roman Sobolewski, “Fabrication and optical properties of ultrathin ferromagnet/superconductor
metallic bilayers”, IEEE Transaction on Superconductivity 15, No. 2, 2942-2945, 2005.
27
R. Latempa, L. Parlato, G. Peluso, G. P. Pepe, A. Ruotolo, A. Barone and A. A. Golubov, “Proximity effect in
NiCu-based Josephson tunnel junctions” IEEE Transaction on Superconductivity 15, No. 2, 133-136 2005.
28
L. Parlato, G. P. Pepe, R. Latempa, P. D’Acunto, G. Peluso, and A. Barone, C. Granata and M. Russo. “High
quality superconducting Josephson junctions on LiNO3 electro-optical crystals”, Appl. Phys. Lett. 86, 202501
(2005).
29
L. Parlato, R. Latempa, G. Peluso and G.P. Pepe, R. Cristiano and R. Sobolewski, “Characteristic electronphonon coupling time in unconventional superconductors and implications for optical detectors” Supercond.
Sci. and Tech. 18 1244–1251 (2005).
30
M. Valentino, C. Bonavolontà, G. Peluso, G. P. Pepe, “Real-time monitoring of fatigue damage in Carbon Fiber
Reinforced Polymers for aeronautical applications using HTS SQUID magnetometer”, EUCAS 2003 Proc., IOP
series (2005).
C. Bonavolontà, M. Valentino and G. Peluso “Non Destructive Evaluation Using Hts Squid Magnetometer To
Detect Impact Damage In Carbon Fiber Reinforced Polymers With Different Fiber Orientation”.
H. J. M. ter Brake, P. C. Bruins, A. Barone, M. Blamire, D. Crete, J. Dam, C. Damen, I. Oomen, T. Ortlepp, G.
P. Pepe, T. Reich, H. Rogalla, E. Tarte, H. F. Uhlmann and M. Valentino “DigiSQUID project: Cryocoolercooled high-Tc digital SQUID magnetometer system for ND applications in unshielded environment”.
M. Valentino, C. Bonavolontà, G. Peluso, G. P. Pepe, “Presented to EUCAS Conference September 2005
Vienna Real-time monitoring of fatigue damage in Carbon Fiber Reinforced Polymers for aeronautical
applications using HTS SQUID magnetometer” published on Inst.Phys.Conf.Ser. IOP Publishing Ltd.
C. Bonavolontà, M. Valentino, V. Palmieri , V. Rampazzo “Magnetometry Based On Magnetic Field Sensors
Applied To Rf Cavities”, published on Physica C, October 2005.
C. Bonavolontà, G. P. Pepe, G. Peluso, M. Valentino, G. Caprino and V. Lopresto, “IEEE Trans.
Electromagnetic non-destructive evaluation of fibreglass/aluminium laminates using HTS SQUID
magnetometers” Appl. Superconductivity 15, N°2, 711-714 (2005).
A. E. Martirosyan, C. Altucci, A. Bruno, C. de Lisio, A. Porzio and S. Solimeno, “Time evolution of plasma
afterglow produced by femtosecond laser pulses”, JOURNAL OF APPLIED PHYSICS, 96, 5450 (2004).
A. Bruno, C. de Lisio and P. Minutolo, “Time resolved fluorescence polarization anisotropy of carbonaceous
particles produced in combustion systems”, OPTICS EXPRESS, 13, 5393 (2005).
B. Ivlev, R. Escudero, G. P. Pepe, R. Latempa, A. Barone, F. Barkov, J. Lisenfield, A. Ustinov, “Extremely
multiphoton phenomena in Josephson Junctions (Euclidean resonance)”, Phys. Rev B 72, 24507 (2005)
A. Ruosi, “Nondestructive detection of e Damage in carbon fibre composites”, Phys. Stat. Sol.(c)2, No.5, 153355 (2005)
C. Bonavolontà, G. Peluso, G. P. Pepe, M. Valentino, Eur. Phys. Journal B, 42, 491-496 (2004)
C. Bonavolontà, G. P. Pepe, G. Peluso, M. Valentino, G. Caprino, V. Lopresto, “Electromagnetic nondestructive evaluation of fibreglass/aluminium laminates by using HTS SQUID magnetometers”, IEEE
Transaction on Superconductivity, Vol. 15, No.2, 711-714 (2005)
R. Salvati, A. Longo, G. Carotenuto, L. Nicolais, S. De Nicola, G. P. Pepe, A. Barone, “UV-Vis spectroscopy for
on-line monitoring of Au nanoparticles”, Applied Surface Science, 248, 179 (2005)
R. Salvati, A. Longo, G. Carotenuto, L. Nicolais, S. De Nicola, G. P. Pepe, Eur. Phys. Journal B, 41, 43-48
(2004)
V. I. Belotelov, G. Carotenuto, L. Nicolais, G. P. Pepe, A.K. Zvezdin, “Optical characterization of the polymer
embedded alloyed bimetallic nanoparticles”, Eur. Phys. Journal B 45, 317-324 (2005)
A. Barone, “Close Encounters with Far Ideas” in “Imagination and Rigor” (S. Termini Ed.), Springer, p.13, (in
press)
A. Barone, R. Cristiano, M. Lisitskiy, C. Nappi, D. Perez de Lara, G. Rotoli, “Recent achievements on
superconductive detectors: Applications and fundamental physics spin-off”, Physica C (in press)
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
Volumes
1
Proc. III int: Conf. on Magnetic and Superconducting Materials (A. Barone as guest editor) Wiley 2004.
A 3
International journals - Published and Submitted papers
1
2
3
4
5
6
7
8
A. Toschi, M. Capone, M. Ortolani, P. Calvani, S. Lupi, C. Castellani, “Temperature dependence of the optical
spectral weight in the cuprates: Role of electron correlations”, Phys. Rev. Lett. 95, 097002 (2005).
Y. N. Ovchinnikov, A. A. Varlamov, “Effect of vortex-antivortex fluctuations on the heat capacity of a type-II
superconducting film”, Phys. Rev. Lett. 94, 107007 (2005).
M. Ortolani, P. Calvani, S. Lupi, “Frequency-dependent thermal response of the charge system and the
restricted sum rules of La2-xSrxCuO4”, Phys. Rev. Lett. 94, 067002 (2005).
D. Bercioux, M. Governale, V. Cataudella, V. M. Ramaglia, “Rashba-effect-induced localization in quantum
networks”, Phys. Rev. Lett. 93, 056802 (2004).
G. Adesso, F. Illuminati, “Equivalence between entanglement and the optimal fidelity of continuous variable
teleportation”, Phys. Rev. Lett. 95, 150503 (2005).
G. Adesso, A. Serafini, F. Illuminati, “Quantification and scaling of multipartite entanglement in continuous
variable systems”, Phys. Rev. Lett. 93, 220504 (2004).
M. Cramer, J. Eisert, F. Illuminati, “Inhomogeneous atomic Bose-Fermi mixtures in cubic lattices”; Phys. Rev.
Lett. 93, 190405 (2004).
A. Sacchetti, M. Baldini, F. Crispoldi, P. Postorino, P. Dore, A. Nucara, C. Martin., A. Maignan, “Temperature
dependence of the optical phonons in SrMnO3 manganite: Evidence of a low-temperature structural transition
in the hexagonal compound”, Phys. Rev. B 72, 172407 (2005).
9
R. Khasanov, D. G. Eshchenko, D. Di Castro, A. Shengelaya, F. La Mattina, A. Maisuradze, C. Baines, H.
Luetkens, J. Karpinski, S. M. Kazakov, H. Keller, “Magnetic penetration depth in RbOs2O6 studied by muon
spin rotation”, Phys. Rev. B 72, 104504 (2005).
10
D. Di Castro R. Khasanov, C. Grimaldi, J. Karpinski, S. M. Kazakov, and H. Keller “Pressure effect on the
magnetic penetration depth in MgB2”, Phys. Rev. B 72, 094504 (2005).
11
D. Bercioux, M. Governale, V. Cataudella, V. Marigliano Ramaglia, “Rashba effect in quantum networks”,
Phys. Rev. B 72, 075305 (2005).
12
A. E. Koshelev, A. A. Varlamov, V. M. Vinokur, “Theory of fluctuations in a two-band superconductor: MgB2”,
Phys. Rev. B 72, 064523 (2005).
13
T. Schneider and D. Di Castro, “Pressure and isotope effect on the anisotropy of MgB2”, Phys. Rev. B 72,
054501 (2005).
14
E. Di Gennaro, P. V. Parimi, W. T. Lu, S. Sridhar, J. S. Derov and B. Turchinetz, “Slow Microwaves in
Lefthanded Materials”, Phys. Rev. B 72, 033110, (2005).
15
G. De Filippis, V. Cataudella, V. M. Ramaglia, C. A. Perroni, “Static and dynamic polaron features in a
coherent-state basis”, Phys. Rev. B 72, 014307 (2005).
16
S. Sarti, C. Amabile, E. Silva, M. Giura, R. Fastampa, C. Ferdeghini, V. Ferrando, C. Tarantini, “Dynamic
regimes in MgB2 probed by swept frequency microwave measurements”, Phys. Rev. B 72, 024542 (2005).
17
S. Lupi, M. Ortolani, L. Baldassarre, P. Calvani, D. Prabhakaran, A. T. Boothroyd, “Optical conductivity and
charge ordering in NaxCoO2”, Phys. Rev. B 72, 024550 (2005).
18
C. Biagini, T. Caneva, V. Tognetti, A. A. Varlamov, “Weak localization effects in granular metals”, Phys. Rev.
B 72, 041102 (2005).
19
M. Iavarone, R. Di Capua, A. E. Koshelev, W. K. Kwok, F. Chiarella, R. Vaglio, W. N. Kang, E. M. Choi, H. J.
Kim, S. I. Lee, A. V. Pogrebnyakov, J. M. Redwing, Xi, XX; “Effect of disorder in MgB2 thin films”, Phys. Rev.
B 71, 214502 (2005).
20
M. Ortolani, D. Di Castro, P. Postorino, I. Pallecchi, M. Monni, M. Putti, P. Dore, “Clean and dirty
superconductivity in pure, A1-doped, and neutron irradiated MgB2: A far-infrared study”, Phys. Rev. B 71,
172508 (2005).
21
C. A. Perroni, V. Cataudella, G. De Filippis, V. M. Ramaglia, “Effects of electron-phonon coupling near and
within the insulating Mott phase”, Phys. Rev. B 71, 113107 (2005).
22
A. A. Abrikosov, D. V. Livanov, A. A. Varlamov, “Electronic spectrum and tunneling properties of multiwall
carbon nanotubes”, Phys. Rev. B 71, 165423 (2005).
23
C. A. Perroni, V. Cataudella, G. De Filippis, V. M. Ramaglia, “Effects of electron-phonon coupling range on the
polaron formation”, Phys. Rev. B 71, 054301 (2005).
24
S. Mercone, C.A. Perroni, V. Cataudella, C. Adamo, M. Angeloni, C. Aruta, G. De Filippis, F. Miletto, A.
Oropallo, P. Perna, A. Y. Petrov, U. Scotti di Uccio, L. Maritato, “Transport properties in manganite thin
films”, Phys. Rev. B 71, 064415 (2005).
25
V. Braccini, A. Gurevich, J. E. Giencke, M. C. Jewell, C. B. Eom, D. C. Larbalestier, A. Pogrebnyakov, Y. Cui,
B. T. Liu, Y. F. Hu, J. M. Redwing, Q. Li, Xi, XX; R. K. Singh, R. Gandikota, J. Kim, B. Wilkens, N. Newman,
J. Rowell, B. Moeckly, V. Ferrando, C. Tarantini, D. Marre, M. Putti, C. Ferdeghini, R. Vaglio, E. Haanappel,
“High-field superconductivity in alloyed MgB2 thin films”, Phys. Rev. B 71, 012504 (2005).
26
M. Salluzzo, A. Cassinese, G. M. De Luca, A. Gambardella, A. Prigiobbo, R. Vaglio, “Transport properties of
Nd1.2Ba1.8Cu3OZ ultrathin films by field-effect doping”, Phys. Rev. B 70, 214528 (2004).
27
V. Cataudella, G. De Filippis, F. Martone, C. A. Perroni, “Variational approach to the optimized phonon
technique for electron-phonon problems”, Phys. Rev. B 70, 193105 (2004).
28
C. Manzo, D. Paparo, L. Marrucci, “Photoinduced random molecular reorientation by nonradiative energy
relaxation: An experimental test”, Phys. Rev. E 70, 051702 Part 1 (2004).
29
A. Di Lisi, S. De Siena, F. Illuminati, D. Vitali, “Quasideterministic generation of maximally entangled states of
two mesoscopic atomic ensembles by adiabatic quantum feedback”, Phys. Rev. A 72, 032328 (2005).
30
G. Adesso, F. Illuminati, “Gaussian measures of entanglement versus negativities: Ordering of two-mode
Gaussian states”, Phys. Rev. A 72, 032334 (2005).
31
A. Serafini, G. Adesso, F. Illuminati, “Unitarily localizable entanglement of Gaussian states”; Phys. Rev. A 71,
032349 (2005).
32
S. M. Giampaolo, F. Illuminati, G. Mazzarella, S. De Siena, “Influence of trapping potentials on the phase
diagram of bosonic atoms in optical lattices”, Phys. Rev. A 70, 061601 (2004).
33
G. Adesso, A. Serafini, F. Illuminati, “Extremal entanglement and mixedness in continuous variable systems”,
Phys. Rev. A 70, 022318 (2004).
34
E. Piegari, C. A. Perroni, V. Cataudella, “Signatures of polaron formation in systems with local and non-local
electron-phonon couplings”, Eur. Phys. J. B 44, 415-421 (2005).
35
M. Barra, A. Cassinese, F. Chiarella, W. Goedel, D. Marczewski, P. Tierno, R. Vaglio, “Electrical properties of
micrometric metallic dots obtained by porous polymeric membranes”, Eur. Phys. J. B 46, 497-500 (2005).
36
M. Barra, C. Collado, J. Mateu, J. M. O'Callaghan, “Miniaturization of superconducting filters using Hilbert
fractal curves”, IEEE Trans. Appl. Superconduct. 15, 3841-3846 (2005).
37
M. Ortolani, P. Calvani, S. Lupi, P. Maselli, “Experimental uncertainty in the far-infrared reflectivity of uniaxial
superconductors”, J. Opt. Soc. Am. B 22, 1994-2000 (2005).
38
G. Adesso, A. Serafini, F. Illuminati, “Entanglement, purity, and information entropies in continuous variable
systems”, Open Systems & Information Dynamics 12 (2): 189-205 (2005).
39
F. Ricci, V. Boffa, G. J. Dai, G. Grassano, R. Mele, A. Tebano, D. Arena, G. Berlin, N. P. Magnani, G. Zarba,
A. Andreone, A. Cassinese, R. Vaglio, “Design and development of a prototype of hybrid superconducting.
receiver front-end for UMTS wireless network: First results and application perspectives”, IEEE Trans. Appl.
Superconduct. 15, 988-991 (2005).
40
A. Andreone, M. Aurino, G. Cifariello, E. Di Gennaro, G. Lamura, P. Orgiani, R. Vaglio, Xi, XX; “Nonlinearity
in the microwave properties of MgB2 thin films: Power dependence and intermodulation distortion”, IEEE
Trans. Appl. Superconduct. 15, 3612-3615 (2005).
41
A. Cassinese, G. M. De Luca, A. Gambardella, A. Prigiobbo, M. Salluzzo, R. Vaglio, “Electrostatic modulation
of conductivity in Nd1.2Ba1.8Cu3Oy thin films”, IEEE Trans. Appl. Superconduct. 15, 2946-2949 (2005).
42
M. Barra, A. Cassinese, W. Ciccognani, E. Limiti, R. Vaglio, “HTS miniaturized filter based on mixed
resonators integrated with a two-stage low-noise amplifier”, Superconductor Science & Technology 18, 623627 (2005).
43
D. Bercioux, V. M. Ramaglia, “The spin-double refraction in two-dimensional electron gas”, Superlattices and
Microstructures 37, 337-340 (2005).
44
A. Paolone, A. Sacchetti, P. Postorino, R. Cantelli, “Comment on effect of chromium substitution on the lattice
vibration of spinel lithium manganate: A new interpretation of the Raman spectrum of LiMn2O4”, J. Phys.
Chem. B 109, 7587-7588 (2005).
45
A. Serafini, M. G. A. Paris, F. Illuminati, S. De Siena, “Quantifying decoherence in continuous variable
systems”; J. Opt. B 7 (4): R19-R36 (2005).
46
P. Fattibene, A. Carosi, V. De Coste, A. Sacchetti, A. Nucara, P. Postorino, P. Dore, “A comparative EPR,
infrared and Raman study of natural and deproteinated tooth enamel and dentin”, Physics in Medicine and
Biology 50, 1095-1108 (2005).
47
M. Barra, A. Cassinese, R. Vaglio, “Current redistribution effects in superconducting microwave
measurements”, Superconductor Science & Technology 18, 271-276 (2005).
48
F. Chiarella, A. Zappettini, P. Ferro, T. Besagni, F. Licci, A. Cassinese, M. Barra, R. Vaglio, C. Aruta “Growth
and characterization of hybrid (CnH2n+1NH3)(2)CuCl4 self-assembled films”, Crystal research and
Technology 40, 1028-1032 (2005).
49
M. Piccinini, M. Cestelli Guidi, A. Marcelli, P. Calvani, E. Burattini, A. Nucara, P. Postorino, A. Sacchetti, E.
Arcangeletti, E. M. Sheregii, J. Polit, A. Kisiel, “Far-infrared synchrotron radiation spectroscopy of solids in
normal and extreme conditions”, Phys. Status Solidi C 2, 236 (2005).
50
A. Paolone, A. Sacchetti, P. Postorino, R. Cantelli, A. Congeduti, G. Rousse, C. Masquelier; “Stabilization of
the orthorombic phase of LiMn2O4 by means of high-pressure”, Solid State Ionics 176, 635 (2005).
51
D. Bercioux, M. Governale, V. Cataudella, V. M. Ramaglia, “Quantum networks in the presence of the Rashba
effect and a magnetic field”, Material Science - Poland 22 553-563 (2004).
52
V. M. Ramaglia, D. Bercioux, V. Cataudella, G. De Filippis, C. A. Perroni, “Spin polarization of electrons with
Rashba double-refraction”, J. Phys. Condensed Matter 16, 9143-9154 (2004).
53
P. Postorino, A. Sacchetti, M. Capone, P. Dore, “Competitive effects on the high-pressure phase diagram of
manganites”, Phys. Status Solidi B 241, 3381-3386 (2004).
54
L. Gianni, A. Cassinese, R. Vaglio, S. Zannella, “Observation and explanation of critical current anomalous
peaks in transport measurements of YBCO coated conductors”, Superconductor Science & Technology 17, L38L40 (2004).
55
C. Manzo, D. Paparo, S. Lettieri, L. Marrucci, “Fluorescence-based investigation of the Janossy effect
anomalous wavelength dependence”, Mol. Cryst. Liq. Cryst. 421, 145-155 (2004).
56
C. A. Perroni, G. Iadonisi, V. K. Mukhomorov, “Formation of polaron clusters”, Eur. Phys. J. B, 41, 163-170
(2004).
57
A. Sacchetti, P. Dore, P. Postorino, A. Congeduti, “Pressure and temperature dependence of optical phonons in
La0.75Ca0.25MnO3”, J. Phys. Chem. Solids 65, 1431-1437 Sp. Iss. SI (2004).
58
E. Di Gennaro, G. Lamura, A. Palenzona, M. Putti, A. Andreone, “Observation of multiband effects in the
microwave complex conductivity of pure and Al-doped MgB2 samples”, Physica C 408: 125-126 (2004).
59
M. Ortolani, S. Lupi, A. Lucarelli, P. Calvani, A. Perla, P. Maselli, M. Capizzi, N. Kikugawa, T. Fujita,
“Imprints of charge stripe excitations in the infrared conductivity of La2-xSrxCuO4”, Physica C 408: 439-440
(2004).
60
A. Nucara, S. Lupi, P. Calvani, “The synchrotron infrared beamline SISSI at ELETTRA”, Infrared Physics &
Technology 45 (5-6): 375-381 (2004).
61
M. C. Guidi, A. Nucara, P. Calvani, P. Postorino, A. Sacchetti, A. Congeduti, M. Piccinini, A. Marcelli, E.
Burattini, “High-pressure far-infrared measurements at SINBAD”, Infrared Physics & Technology 45, 365-368
(2004).
62
J. Polit, E. M. Sheregii, J. Cebulski, M. Pociask, A. Kisiel, A. Mycielski, B. V. Robouch, E. Burattini, A.
Marcelli, M. C. Guidi, M. Piccinni, P. Calvani, A. Nucara, “Manifestation of defects in phonon spectra of binary
zinc-blende compounds”, Eur. Phys. J. – Appl. Phys. 27, 321-324 (2004).
63
F. Illuminati and A. Albus, “High-Temperature Atomic Superfluidity in Lattice Bose-Fermi Mixtures”, Phys.
Rev. Lett. 93, 090406 (2004).
64
A. Cassinese, M. Barra, W. Ciccognani, M. Cirillo, M. De Dominicis, E. Limiti, A. Prigiobbo, R. Russo and R.
Vaglio “Miniaturized Superconducting filter realized by using dual mode and stepped resonators”, IEEE Trans.
On Microwave Theory and Technique Vol 52, pp 97-103 (2004).
65
A. Prigiobbo, M. Barra, A. Cassinese, M. Cirillo, F. Marafioti, R. Russo and R. Vaglio, “Superconducting
resonators for telecommunication application based on fractal layout, Superconducting Science and
Technology”, 17, S427 2004.
66
G. Malandrino, L. M. S. Perdicaro, G. Condorelli, I. L. Fragalà, A. Cassinese and M. Barra. “Synthesis and
characterization of La2-xBaxCuO4+d thin film through a simple MOCVD approach”, Journal of Material
Chemistry, 15,4718 (2005).
67
G. Malandrino, L. M.S.Perdicaro, G. Conderelli, A. Cassinese, A. Prigiobbo and I. L. Fragalà, “Fabrication of
TlBa2CaCu2O7 c-axis oriented through a Hybrid In situ MOCVD Process”, Chemical Vapor ressare o 11,
381 (2005).
68
S. Sarti , E. Silva, M. Giura, R. Fastampa, M. Boffa, A. M. Cucolo, “Dynamic regimes in YBa2Cu3O(7-delta) in
applied magnetic field probed by swept frequency microwave measurements”, Journal of Physics-Condensed
Matter vol. 16, pp. 6969 (ott. 2004).
69
M. Giura, R. Fastampa, S. Sarti, E. Silva, “C-axis transport and phenomenology of the pseudogap state in
Bi2Sr2CaCu2O(8+delta)”, Physical Review. B vol. 70, p 214530 (dic. 2004).
70
N. Pompeo, R. Marcon, L. Mèchin and E. Silva, “Effective surface impedance of YBa2Cu3O7−δ films on silicon
substrates”, Supercond. Sci. Technol. 18 (2005) 531–537.
International journals – Yet unpublished papers
1
R. Khasanov, D. Di Castro, M. Belogolovskii,, Yu. Paderno, V. Filippov, R. Brütsch, and H. Keller,
“Anomalous electron-phonon coupling probed on the surface of ZrB12 superconductor”, Phys. Rev. B, in press.
2
A. Sacchetti, M. Baldini, P. Postorino, C. Martin, A. Maignan, “Raman Spectroscopy on cubic and hexagonal
SrMnO3” , Journal of Raman Spectroscopy, in press.
3
P. Dore, P. Postorino, A. Sacchetti, M. Baldini, R. Gianbelluca, M. Angeloni, G. Balestrino, “Raman
measurements on thin films of the La0.7Sr0..3MnO3 manganite: a direct probe of substrate induced effects”, Eur.
Phys. J. B, in press.
4
P. Dore, P. Postorino, A. Sacchetti, A. Congeduti, F. A. Gorelli, L. Ulivi, D. D. Sarma, “Evidence of phase
separation in the phase diagram of the La0.75Ca0.25MnO3 by infrared measurements”, Journal of
Superconductivity, in press.
5
M. Ortolani, P. Calvani, S. Lupi, U. Schade, A. Perla, M. Fujita, and K. Yamada, “Use of Coherent Synchrotron
Radiation in a study on cuprates exhibiting superconductivity and charge ordering”, Infrared Physics and
Technology, in press.
6
M. Cestelli Guidi, M. Piccinini, A. Marcelli, A. Nucara, P. Calvani, and E. Burattini, “Optical performances of
SINBAD, the Synchrotron Infrared Beamline At Dafne”, J. Opt. Soc. Am. A, 22, 2810-2817 (2005).
7
G. Lamura, A. Gauzzi, S. M. Kazakov, J. Karpinski, and A. Andreone, “High resolution measurements of the
magnetic penetration depth on Yba2Cu4O8 single crystals”, J. Phys. Chem. Solids 66, in press.
8
M. Aurino, F. Di Iorio, E. Di Gennaro, G. Lamura, A. Gauzzi, and A. Andreone, “Discrete model analysis of the
critical current density measurements in superconducting thin films by a single coil inductive method”, J. Appl.
Phys. 98, in press.
9
L. Catani, A. Cianchi, J.Lorkiewicz, S. Tazzari, J. Langner, A. Andreone, G. Cifariello, E. Di Gennaro, G.
Lamura, and R. Russo, “Cathodic Arc Grown Niobium films for RF Superconducting Cavity Applications”,
Physica C, in press.
10
S. Lupi, M. Ortolani, L. Baldassarre, U. Schade, P. Calvani, Y. Takano, M. Nagao, T. Takenouchi, and H.
Kawarada, “Sub-Terahertz electrodynamics of superconducting diamond”, Nature physics, submitted.
11
M. Ortolani, P. Calvani, S. Lupi, U. Schade, A. Perla, M. Fujita, and K. Yamada, “Effect of superconductivity
and charge ordering on the sub-THz reflectivity of La1.875Ba0.125-ySryCuO4”, Phys. Rev. Lett. B, submitted.
12
A. Sacchetti, M. Cestelli Guidi, E. Arcangeletti, A. Calvani, A. Marcelli, A. Nucara, M. Piccinini, and P.
Postorino, “Far-infrared absorption of La1-xCaxMnO3-y at high pressare” , Phys. Rev. Lett., in press.
13
M. Monni, M. Affronte, D. Di Castro, C. Ferdeghini, M .Lavagnini, P. Manfrinetti, A. Orecchini, A. Palenzona,
C. Petrillo, P. Postorino, A. Sacchetti, F. Sacchetti, M. Putti, “Role of charge doping and lattice distortion in
alloyed MgB2”, Phys. Rev. Lett., submitted.
14
R. Di Capua, C. A. Perroni, V. Cataudella, F. Miletto Granozio, M. Salluzzo, R. Vaglio, P. Perna, U. Scotti di
Uccio, “Direct observation of multi-scale inhomogeneities on La0.7Sr0.3MnO3 thin films by scanning tunneling
spectroscopy”, Phys. Rev. Lett., submitted.
15
G. Cifariello, M. Aurino, E. Di Gennaro, G. Lamura, P. Orgiani, J. C. Villegier, X. X. Xi, and A. Andreone,
“Intrinsic non linearity probed by intermodulation distortion microwave measurements on MgB2 thin films
grown by HPCVD”, Appl. Phys. Lett., submitted.
16
A. Nucara, P. Calvani, F. Crispoldi, D. Sali, S. Lupi, C. Martin, and A. Maignan, “Infrared observation of the
Hund’s mechanism in an electron-doped manganite”, Phys. Rev. B, in press.
17
M. Angeloni, C. Aruta, G. Balestrino, N. G. Boggio, B. Davidson, P. G. Medaglia, A. Tebano, M. Baldini, D. Di
Castro, P. Postorino, P. Dore, A. Sidorenko, G. Allodi, R. De Renzi, “Preparation and characterization of
LaMnO3 thin film grown by pulsed Laser deposition”, J. Appl. Phys., submitted.
18
A. Sacchetti, P. Postorino, M. Capone, “High-pressure phase diagram in the manganites: a two-site model
study”, New Journal of Physics, submitted.
19
A. Cassinese, M. Barra, M. Biasiucci and P. D’Angelo, “Field effect devices based on SrTiO3 gate dielectrics
for the investigation of charge carrier mobility in macromolecular films”, Accepted on Macromolecular
Symposia.
Volumes
1
A. I. Larkin, A. A. Varlamov, “Theory of fluctuations in superconductors”, Monograph, 432 pages, Oxford
University Press, (2005).
2
L. G. Aslamazov, A. A. Varlamov “Wonders of Physics”, English version, WSPC, (2005). Russian version
Moscow, Добросвет, (2005).
3
V. M. Ramaglia, “Electronic structure of atoms (theory)”, in "Encyclopedia of Condensed Matter Physics" eds.
F. Bassani, G. Liedl, P. Wyder, Elsevier (2005) 67-75.
S 2
International journals - Published and Submitted papers
1
S. Amoruso, G. Ausanio, A. C. Barone, R. Bruzzese, L. Gragnaniello, M. Vitiello, X. Wang, “Ultrashort laser
ablation of solid matter in vacuum: a comparison between the picosecond and femtosecond regimes”, J. Phys.
B: At. Mol. Opt. Phys. 38, L329-L338 (2005).
2
S. Amoruso, R. Bruzzese, M. Vitiello, N. N. Nedialkov, P. A. Atanasov, “Experimental and theoretical
investigations of femtosecond laser ablation of aluminum in vacuum”, J. Appl. Phys. 98, 044907 (2005).
3
S. Amoruso, G. Ausanio, R. Bruzzese, M. Vitiello, X. Wang, “Femtosecond laser pulse irradiation of solid
targets as a general route to nanoparticle formation in a vacuum”, Phys. Rev. B 71, 033406 (2005).
4
M. Vitiello, S. Amoruso, C. Altucci, C. de Lisio, X. Wang, “The emission of atoms and nanoparticles during
femtosecond laser ablation of gold”, Appl. Surf. Sci. 248, 163-166 (2005).
5
S. Amoruso, G. Ausanio, M. Vitiello, X. Wang, “Infrared femtosecond laser ablation of graphite in high
vacuum probed by optical emission spectroscopy”, Appl. Phys. A 81, 981-986 (2005).
6
S. Amoruso, G. Ausanio, C. de Lisio, V. Iannotti, M. Vitiello, X. Wang, L. Lanotte, “Syntheis of Nickel
nanoparticles and nanoparticles magnetic films by femtosecond laser ablation in vacuum”, Appl. Surf. Sci. 247,
71-75 (2005).
7
S. Amoruso, R. Bruzzese, N. Spinelli, R. Velotta, M. Vitiello, X. Wang, C. Altucci, C. de Lisio, “Study of the
plasma plume generated during near IR femtosecond laser irradiation of silicon targets”, Appl. Phys. A 79,
1377-1380 (2004).
8
G. Ausanio, A. C. Barone, V. Iannotti, L. Lanotte, S. Amoruso, R. Bruzzese, M. Vitiello, “Magnetic and
morphological properties of nickel nanoparticles produced by femtosecond laser ablation”, Appl. Phys. Lett.
85, 4103-4105 (2004).
9
S. Amoruso, R. Bruzzese, N. Spinelli, R. Velotta, M. Vitiello, X. Wang, “Emission of nanoparticles during
ultrashort laser irradiation of silicon targets”, Europhys. Lett. 67, 404-410 (2004).
10
S. Amoruso, G. Ausanio, R. Bruzzese, L. Lanotte, P. Scardi, M. Vitiello and X. Wang, “Synthesis of nanocrystal
films via femtosecond laser ablation in vacuum”, J. Phys.: Condens. Matter in press.
11
G. Ausanio, A. C. Barone, V. Iannotti, P. Scardi, M. D’Incau, S. Amoruso, M. Vitiello and L. Lanotte,
“Morphology, structure and magnetic properties of (Tb0.3Dy0.7Fe2)100−xFex nanogranular films produced by
ultrashort pulsed laser deposition”, Nanotechnology. In press.
12
G. Ausanio, S. Amoruso, A. C. Barone, R. Bruzzese, V. Iannotti, L. Lanotte, M. Vitiello, “Production of
nanoparticles of different materials by means of ultrashort laser pulses”, Appl. Surf. Sci. In press.
13
S. Amoruso, G. Ausanio, R. Bruzzese, L. Gragnaniello, L. Lanotte, M. Vitiello, X. Wang, “Characterization of
laser ablation of solid targets with near-infrared laser pulses of 100 fs and 1 ps duration”, Appl. Surf. Sci. In
press.
Volumes
1
S. Amoruso, M. Vitiello, X. Wang, “Characterization of plumes produced during ultrashort laser ablation of
metals and semiconductors”, in Laser Physics and Applications – 13th International School on Quantum
Electronics, Eds. P.A. Atanasov, S.V. Gateva, L.A. Avramov, and. A.A. Serafetinides, Proceedings of SPIE vol.
5830, 11-20 (2005).
2
S. Amoruso, M. Vitiello, X. Wang, “Femtosecond laser ablation and deposition”, in Pulsed Laser Deposition of
Optoelectronic Films - Series "Optoelectronic Materials and Devices" edited by M. Popescu (INOE Publishing
House, Sofia, 2005).
J. Schou, S. Amoruso and J. G. Lunney, “Plume Dynamics”, in Laser Ablation and Its Applications, Edited by
C.R. Phypps (Springer), in press.
3
S 4
International journals - Published and Submitted papers
1
F. Tafuri and J. R. Kirtley “High Tc Superconductor Weak Links”, Rep. Prog. Phys. 68, 2573 (2005).
2
T. Bauch, F. Lombardi, F. Tafuri, A. Barone, G. Rotoli, P. Delsing and T. Claeson, “Macroscopic Quantum
Tunneling in d-wave YBaCuO Josephson Junctions”, Phys. Rev. Lett. 94, 87003 (2005).
3
F. Tafuri, J. R. Kirtley, D. Born, D. Stornaiuolo, P. G. Medaglia, P. Orgiani, G. Balestrino and V. G. Kogan,
“Dissipation in ultra-thin current-carrying superconducting bridges; evidence for quantum tunneling of Pearl
vortice”s, Europhys. Lett. (2006)
4
V. D’Auria, A. Chiummo, M. De Laurentis, A. Porzio, S. Solimeno, and M. G. A. Paris, “Tomographic
characterization of OPO sources close to threshold”, Optics Express, 13:948, (2005);
5
V. D'Auria, A. Porzio, S. Solimeno, S. Olivares and M. G. A. Paris “Characterization of bipartite states using a
single homodyne detector”, J. Opt. B: Quantum Semiclass. Opt. 7:S750–S753 (2005);
A. Porzio, P. Aniello, A. Chiummo, V. D’Auria, S. Solimeno and M. G. A.Paris “Secure communication using
bright twin-beam and polarization encoding”, accepted for publication in Optics and Laser in Engineering. In
press.
V. D’Auria, C. de Lisio, A. Porzio, S. Solimeno and M. G. A. Paris “Transmittivity measurements by means of
squeezed vacuum light”, J. Phys. B (November 2005). In press.
G. Cella, A. Di Virgilio, P. La Penna, V. D'Auria, A. Porzio, I. Ricciardi, and S. Solimeno, “Optical response of
a misaligned and suspended Fabry-Perot cavity”, submitted to Phys. Rev. A (December 2005). In press.
A. Di Virgilio, L. Barsotti, S. Braccini, C. Bradaschia, G. Cella, C. Corda, V. Dattilo, I. Ferrante, F. Fidecaro, I.
Fiori, F. Frasconi, A. Gennai, A. Giazotto, P. La Penna, G. Losurdo, E. Majorana, A. Pasqualetti, D. Passuello,
F. Piergiovanni, A. Porzio, P. Puppo, P. Rapagnani, F. Ricci, S. Solimeno, F. Vetrano, “Evidence of an optical
spring”, submitted to Physical Review Letters (December 2005). In press.
6
7
8
9
SN 1
International journals - Published and Submitted papers
1
G. Ausanio, A. C. Barone, V. Iannotti, L. Lanotte, S. Amoruso, R. Bruzzese, M. Vitiello, “Magnetic and
morphological characteristics of nickel nanoparticles films produced by femtosecond laser ablation”, Appl.
Phys. Lett. 85, 4103 (2004)
2
S. Amoruso, G. Ausanio, A.C. Barone, R. Bruzzese, L. Gragnaniello, M. Vitiello , X. Wang, “Ultrashort laser
ablation of solid matter in vacuum: A comparison between the picosecond and femtosecond regimes”, J. Phys.
B-At. Mol. Opt. 38, L329 (2005)
3
S. Amoruso, G. Ausanio, M. Vitiello, X. Wang , “Infrared femtosecond laser ablation of graphite in high
vacuum probed by optical emission spectroscopy”, Appl. Phys. A 81, 981 (2005)
4
S. Amoruso, G. Ausanio, C. De Lisio, V. Iannotti, M. Vitiello, X. Wang, L. Lanotte, “Synthesis of nickel
nanoparticles and nanoparticles magnetic films by femtosecond laser ablation in vacuum”, Appl. Surf. Sci. 247,
71(2005)
5
S. Amoruso, G. Ausanio, R. Bruzzese, M. Vitiello, X. Wang, “Femtosecond laser pulse irradiation of solid
targets as a general route to nanoparticle formation in a vacuum”, Phys.Rev. B 71, 1 (2005).
S. Amoruso, G. Ausanio, R. Bruzzese, L. Lanotte, P. Scardi, M. Vitiello and X. Wang, “Synthesis of nanocrystal
films via femtosecond laser ablation in vacuum”, J. Phys.: Condens. In press.
G. Ausanio, A. C. Barone, V. Iannotti, P. Scardi, M. D’Incau, S. Amoruso, M. Vitiello and L. Lanotte,
“Morphology, structure and magnetic properties of (Tb0.3Dy0.7Fe2)100−xFex nanogranular films produced by
ultrashort pulsed laser deposition”, Nanotechnology. In press.
G. Ausanio, S. Amoruso, A. C. Barone, R. Bruzzese, V. Iannotti, L. Lanotte, M. Vitiello, “Production of
nanoparticles of different materials by means of ultrashort laser pulses”, Appl. Surf. Sci. In press.
S. Amoruso, G. Ausanio, R. Bruzzese, L. Gragnaniello, L. Lanotte, M. Vitiello, X. Wang, “Characterization of
laser ablation of solid targets with near-infrared laser pulses of 100 fs and 1 ps duration”, Appl. Surf. Sci. In
press.
6
7
8
9
SN 2
International journals - Published and Submitted papers
1
L. Parlato, R. Latempa, G. Peluso and G.P. Pepe, R. Cristiano and R. Sobolewski, “Characteristic electronphonon coupling time in unconventional superconductors and implications for optical detectors”,
Superconductor Science and Technology 18 1244–1251 (2005)
2
G. P. Pepe, L. Parlato, R. Latempa, P. D’Acunto, N. Marrocco, C. De Lisio, C Altucci, G. Peluso, A. Barone, T.
Taneda, and Roman Sobolewski, “Fabrication and optical properties of ultrathin ferromagnet/superconductor
metallic bilayers”, IEEE Transaction on Superconductivity Vol. 15, No. 2, 2942-2945, (2005)
3
L. Parlato, G. P. Pepe, R. Latempa, C. De Lisio, C. Altucci, P. D’Acunto, G. Peluso, A. Barone, T. Taneda and
R. Sobolewski, “Time-resolved photoresponse of nanometer-thickness Nb/NiCu bilayers”, Applied Surface
Science 248, 177 (2005)
4
S. Pagano, E. Esposito, M. Ejrnaes, C. Nappi, and R. Cristiano, “Kinetic Inductance Detectors for Mass
Spectroscopy”, IEEE Transactions on Applied Superconductivity, vol. 15, no. 2, (2005)
International journals – Yet unpublished papers
5
G. P. Pepe, M. Amanti, C. De Lisio, R. Latempa, N. Marrocco, L. Parlato, G. Peluso, A. Barone, R.
Sobolewski, and T. Taneda “Ultrafast photoresponse of superconductor/ferromagnet Nb/NiCu
heterostructures”, Phys.stat. Sol. In press.
6
R. Leoni, F. Mattioli, M. G. Castellano, S. Cibella, P. Carelli, S. Pagano, D. Perez de Lara, M. Ejrnaes, M. P.
Lisitskyi, E. Esposito, R. Cristiano, C. Nappi, “Fabrication and Test of Superconducting Single Photon
Detectors”, NIMA. In press.
7
D. Perez de Lara, M. Ejrnaes, S. Pagano, M. Lisitskiy, E. Esposito, C. Nappi, R. Cristiano, “Advanced
superconducting optical detectors”, Journal of Physics: Conference Series. In press.
8
R. Cristiano, M. Ejrnaes, E. Esposito, M. P. Lisitskyi, C. Nappi, S. Pagano, and D. Perez de Lara,
“Nonequilibrium superconducting detectors”, Superconductor Science and Technology. In press.
SN 3
International journals - Published and Submitted papers
1
M. Salluzzo, A. Cassinese, G. M. De Luca, A. Gambardella, A. Prigiobbo, and R. Vaglio “Transport properties
of Nd1.2Ba1.8Cu3OZ ultrathin films by field-effect doping”, Phys. Rev. B Vol. 70, 214528 (2004).
2
3
G. M. De Luca, G. Ausanio, M. Salluzzo and R. Vaglio, “Growth mode selection and transport properties in
Nd1Ba2Cu3O7 superconducting films deposited by high oxygen pressure diode sputtering”, Supercond. Sci.
Technol. (2005).
A. Cassinese, G. M. De Luca, A.Gambardella, A. Prigiobbo, M. Salluzzo and R. Vaglio, “Electrostatic
Modulation of Conductivity in Nd1.2Ba1 .8Cu3Oy Thin Films”, IEEE Trans on Appl. Supercond., (2005).
EX 1
International journals - Published and Submitted papers
1
2
3
4
5
6
7
V. Tkachenko, A. Marino, F. Vita, F. D’Amore, L. De Stefano, M. Malinconico, M. Rippa, G. Abbate,
“Spectroscopic Ellipsometry Study of Liquid Crystal and Polymeric Thin Films in Visible and Near Infrared”,
Eur. Phys. J. E, 14, 185-192 (2004).
A. Marino, G. Abbate, W. Cao, P. Palffy-Muhoray, B. Taheri, “Lasing Thresholds of Cholesteric Liquid
Crystals Lasers”, Electronic Liquid Crystal Communications, 2004/Oct/10 11:20:18 (2004).
A. Marino, G. Abbate, W. Cao, P. Palffy-Muhoray, B. Taheri, “Lasing Thresholds of Cholesteric Liquid
Crystals Lasers”, Mol. Cryst and Liq. Cryst., 429, 101-110 (2005)
L. Sirleto, G. Coppola, G. C. Righini, G. Abbate, “Photonics devices based on hybrid approach combining
liquid crystals and sol-gel waveguides”, Mol. Cryst and Liq. Cryst. 429, 149-165 (2005)
F. Vita, A. Marino, V. Tkachenko, D. E. Lucchetta, L. Criante, F. Simoni, and G. Abbate “Near infrared
characterization and modeling of nanosized holographic-polymer dispersed liquid crystal”, Phys. Rev. E, 72,
011702 (2005)
G. Abbate, F. Vita, A. Marino, V. Tkachenko, S. Slussarenko, “LC-Polymer composites for the realization of
passive and active optoelectronic components”, Opt. Pur. y Apl. 38 (3), 11-19 (2005)
M. Loulou, R. Gharbi, M. Fathallah, G. Ambrosone, U. Coscia, G. Abbate, A. Marino, S. Ferrero and E. Tresso,
“Structural, optical and electrical properties of helium diluted a-Si1-xCx:H films deposited by PECVD”, Journal
of Non-Crystalline Solids, accepted (2005)
8
A. Marino, F. Vita, V. Tkachenko, R. Caputo, C. Umeton, A. Veltri, G. Abbate, “Dynamical behaviour of
holographic polymer-liquid crystal gratings”, Proceedings of LFNM 2004, p. 228 (2004). IEEE cat. #
04TH8741
9
J. N. Hilfiker, C. M. Herzinger, T. Wagner, A.Marino, G. Delgais, and G. Abbate, “Mueller-Matrix
Characterization of Liquid Crystals”, Thin Solid Films, 455-456, 591 (2004).
10
A. Marino, F. Vita, V. Tkachenko, R. Caputo, C. Umeton, A. Veltri, G. Abbate, “Dynamical Behaviour of
Policryps Gratings”, Eur. Phys. J. E 15, 47-52 (2004).
11
V. Tkachenko, A. Marino, F. Vita, F. D’Amore, L. De Stefano, M. Malinconico, M. Rippa, G. Abbate,
“Spectroscopic Ellipsometry Study of Liquid Crystal and Polymeric Thin Films in Visible and Near Infrared”,
Electronic Liquid Crystal Communications, 2004/Feb/26 (2004).
12
V. Tkachenko, A. Marino, F. Vita, F. D’Amore, L. De Stefano, M. Malinconico, M. Rippa, G. Abbate,
“Spectroscopic Ellipsometry Study of Liquid Crystal and Polymeric Thin Films in Visible and Near Infrared”,
Eur. Phys. J. E, 14, 185-192 (2004).
EX 2
International journals - Published and Submitted papers
1
G. Pesce, A. Sasso, P. Netti, S. Fusco, “Optical tweezers as a tool for for microrheology of simplex and complex
fluids”, Proceedings of SPIE, in “Optical Trapping and Optical Micromanipulation”, Vol. 5514 (2004).
2
3
4
5
E. Del Gado, A. Fierro, L. de Arcangelis and A. Coniglio, Physical Review E 69, 051103 (2004).
A. de Candia, E. Del Gado, A. Fierro, N. Sator and A. Coniglio Physica A, 358, 239 (2005).
E. Del Gado and W. Kob, Europhys. Lett. 72, 1032 (2005).
A. Coniglio, L. de Arcangelis, E. Del Gado, A. Fierro and N. Sator, J. Phys. C: Condens. Matter 16, S4831
(2004).
6
F. Mallamace, S. H. Chen, A. Coniglio, L. de Arcangelis, E. Del Gado and A. Fierro, accepted in PRE Rapid
Communications (2005).
7
A. Coniglio, A. Fierro, M. Nicodemi, M. Pica Ciamarra, and M. Tarzia, “Statistical mechanics of dense
granular media”, J. Phys.: Condens. Matter. 17 (24), S2557-S2572 (2005).
8
M. Tarzia, A. Fierro, M. Nicodemi, M. Pica Ciamarra, and A. Coniglio, “Size segregation in granular media
induced by phase transition”, Phys. Rev. Lett 95, 078001 (2005).
9
A. Fierro, M. Nicodemi, M. Tarzia, A. de Candia, and A. Coniglio, “Jamming transition in granular media: A
mean-field approximation and numerical simulations”, Phys. Rev. E 71, 061305 (2005).
10
11
A. de Candia, “Effective potential in glass forming liquids”, J. Stat. Mech. L02001 (2005).
12
M. Tarzia, A. Fierro, M. Nicodemi and A. Coniglio, “Segregation in fluidized versus tapped packs”, Phys.
Rev. Lett. 93, 198002 (2004).
13
A. Coniglio, L. De Arcangelis, E. Del Gado, A. Fierro and N. Sator, “Percolation, gelation and dynamical
behaviour in colloids”, J. Phys.: Condens. Matter. 16 (42), S4831-S4839 (2004).
14
A. Coniglio, A. de Candia, A. Fierro, M. Nicodemi, and M. Tarzia, “Statistical mechanics approach to the
jamming transition in granular materials”, Physica A 344 (3-4), 431-439 (2004).
15
16
A. Fierro, “Glass transition in models with controlled frustration”, Phys. Rev. E 70, 012501 (2004).
T. Abete, A. de Candia, D. Lairez, and A. Coniglio, “Percolation Model for Enzyme Gel Degradation”, Phys.
Rev. Lett. 93, 228301 (2004).
17
M. Nicodemi and H.J. Jensen, “Time dependent phenomena in transport properties and I-V
characteristics of a model for driven vortex matter” Jour. Phys.: Cond. Matt. 16, 6789 (2004).
18
A. Caiazzo, A. Coniglio, and M. Nicodemi, “Glass glass transition and new dynamical singularity points
in an analytically solvable $p$-spin glass like model”, Phys. Rev. Lett. 93, 215701 (2004).
19
M. Pica Ciamarra, A. Coniglio, and M. Nicodemi, “Shear-induced segregation of a granular mixture under
horizontal oscillation”, Jour. Phys.: Cond. Matt. 17, S2549 (2005).
20
L. P. Oliveira, H. J. Jensen, M. Nicodemi, and P. Sibani, ”Record dynamics and the observed temperature
plateau in the magnetic-creep rate of type-II superconductors”, Phys. Rev. B 71, 104526 (2005). Note: selected
for the April 1, 2005 issue of Virtual Journal by the American Institute of Physics and the American Physical
Society
21
M. Pica Ciamarra, A. Coniglio, and M. Nicodemi, “Shear instabilities in granular mixtures”, Phys. Rev. Lett.
94, 188001 (2005).
22
P. Richard, M. Nicodemi, R. Delannay, P. Ribi\`ere, D. Bideau, “Slow relaxation and compaction of granular
systems”, Nature Materials 4, 121 (2005). Note: Nature Materials Highlight of February 2005 Compaction in a
sand box.
A. Gamba, A. de Candia, S. Di Talia, A. Coniglio, F. Bussolino, and G. Serini, “Diffusion limited phase
separation in eukaryotic chemotaxis”, Proc. Nat. Acad. Sci. 102, 16927 (2005).
International journals – Yet unpublished papers
1
P. Zemanek, V. Karasek, A. Sasso,“Optical forces acting on Rayleigh particle placed into interference field”,
Opt. Commun., 240, 401-415 (2004).
2
A. Casaburi, G. Pesce, A. Sasso, P. Zemanek, “Two- and three-beam interferometric optical traps”, Opt.
Commun., 251, 393-404 (2005)
3
A. Sasso and G. Pesce, “Optical tweezers calibration: a quantitative tool for local viscosity investigation”,
Proceedings of SPIE, Vol. 5514, pp. 487-493 (2004). ISBN/ISSN: 0-8194-5452-4/0277-786X.
4
G. Pesce, A. Sasso, S. Fusco, “Optical tweezers for local rheological investigations”, Rev. Scient. Instr., 76,
115105 (2005).
5
6
M. Tarzia and A. Coniglio “Pattern Formation and Glassy phase in $\Phi4$ theory with screened electrostatic
repulsion” Phys Rev Lett. In press.
M. Pica Ciamarra, A. D. De Vizia, M. Tarzia, A. Fierro, M. Nicodemi and A. Coniglio “Granular segregation
under vertical tapping” submitted to Phys Rev Lett.
EX 3
International journals - Published and Submitted papers
1
L. Ferraioli, P. Maddalena, E. Massera, A. Parretta, M.A. Green, A. Wang, J. Zhao, “Evidence for generalized
Kirchhoff’s law from angle-resolved electroluminescence of high efficiency silicon solar cells”, Appl. Phys.
Lett., 85, 2484, (2004).
2
G. Ambrosone, U. Coscia, S. Lettieri, P. Maddalena, C. Minarini, S. Ferrero, S. Restello, V. Rigato “Deposition
Of Microcrystalline Silicon-Carbon Films By PECVD”, Thin Solid Films, 451-452 (2004) 274-279.
G. Ambrosone, G. Barucca, U. Coscia, S. Ferrero, S. Lettieri, P. Maddalena “Deposition Of µc-SiC:H Alloys In
Low Power Regime” J. Non Cryst. Solids, 338-340, 163-167 (2004).
S. Lettieri, F. Gesuele, P. Maddalena, M. Liscidini, L.C. Andreani, C. Ricciardi, V. Ballarini, F. Giorgis,
“Second Harmonic Generation in a-Si1-xNx:H doubly resonant microcavities with periodic dielectric mirrors”,
Appl. Phys. Lett., 87, , (2005).
L. De Stefano, I. Rendina, M. De Stefano, A. Bismuto, P. Maddalena, “Marine Diatoms as Optical Chemical
Sensors”, Appl. Phys. Lett., 87, 233902, (2005).
L. Ferraioli, P. Maddalena, A. Parretta, A. Wang, J. Zhao, “Current-Voltage Characteristics of High Efficiency
Silicon Solar Cells from Photoluminescence” Appl. Phys. Lett., 85, 4222, (2004).
S. Lettieri, U. Bernini, E. Massera, P. Maddalena, “Optical investigations on thermal conductivity in n- and ptype porous silicon”, Phys. Stat. Sol. (c), 2, 3414 (2005).
U. Coscia, G. Ambrosone, S. Lettieri, P. Maddalena, V. Rigato, S. Restello, E. Bobeico, M. Tucci, “Preparation
of Microcrystalline Silicon-Carbon Films”, Sol. Energ. Mat. Sol. C., 87, 433 (2005)
G. Ambrosone, U. Coscia, S. Lettieri, P. Maddalena, C. Minarini, V. Parisi, S. Schutzmann, “Crystallization of
Hydrogenated Amorphous Silicon-carbon Films by Means of Laser Treatments”, Appl. Surf. Sc., 247, 471
(2005).
3
4
5
6
7
8
9
10
11
G. Di Francia, L. Quercia, I. Rea, P .Maddalena, S. Lettieri, “Nanostructure reactivity: confinement energy and
charge transfer in Porous Silicon”, Sens. & Act. B, 111-112, 117, (2005).
U. Bernini, P. Maddalena, E. Massera, P. Rucco, “Determination of Thermal Diffusivity of Suspended Porous
Silicon Films by Thermal Lens Technique”, Appl. Phys. A, 81, 399, (2005).
12
G. Ambrosone, U. Coscia, S. Lettieri, P. Maddalena, M. Della Noce, S. Ferrero, S. Restello, V. Rigato, M.
Tucci, “Silicon-Carbon Films Deposited at Low Substrate Temperature”, J. Non Cryst. Solids, accepted, (2005).
13
E. Luppi, E. Degoli, G. Cantele, S. Ossicini, R. Magri, D. Ninno, O. Bisi, O. Pulci, G. Onida, M. Gatti, A. Incze,
R. Del Sole, “The electronic and optical properties of silicon nanoclusters: absorption and emission”, Optical
Materials 27, 1008 (2005).
14
G. Festa, M. Cossi, V. Barone, G. Cantele, D. Ninno, G. Iadonisi, “A first-principle study of the adsorption of 1amino-3-cyclopentene on the (100) silicon surface”, J. Chem. Phys 122, 184714 (2005).
15
G. Cantele, E. Degoli, E. Luppi, R. Magri, D. Ninno, O. Bisi, S. Ossicini, G. Iadonisi, Electronic, “Structural
and optical properties of hydrogenated silicon nanocrystals: the role of the excited states”, Phys. Stat. Sol. (c)
2, 3263 (2005).
16
E. Degoli, S. Ossicini, G. Cantele, E. Luppi, R. Magri, D. Ninno, O. Bisi, “Formation energies of silicon
nanocrystals: role of dimension and passivation”, Phys. Stat. Sol. (c) 2, 3354 (2005).
F. Trani, G. Cantele, D. Ninno, G. Iadonisi, “Tight binding calculations for the optical properties of ellipsoidal
silicon nanocrystals”, Phys. Stat. Sol. (c) 2, 3435 (2005).
17
18
F. Trani, G, Cantele, D. Ninno, G. Iadonisi, “Tight-binding calculation of the optical absorption cross section of
spherical and ellipsoidal silicon nanocrystals”, Phys. Rev. B 72, 75423 (2005).
19
G. Cantele, E. Degoli , E. Luppi, R. Magri, D. Ninno, G. Iadonisi, S. Ossicini, “First-principles study of n- and
p-doped silicon nanoclusters”, Phys. Rev B 72 , 113303 (2005).
20
G. Iadonisi, V. K. Mukhomorov, G. Cantele, D. Ninno, “Criteria for the appearance of a periodical component
in the polaron distribution function”, Phys. Rev. B 72, 94305 (2005).
21
S. Ossicini, E. Degoli, F. Iori, E. Luppi, R. Magri, G. Cantele, F. Trani, D. Ninno, “Simultaneously B- and Pdoped silicon nanoclusters: Formation energies and electronic properties”, Appl. Phys. Lett. 87, 173120
(2005).
22
C. A. Perroni, G. Iadonisi, and V. K. Mukhomorov, “Formation of polaron clusters”, Eur. Phys. J. B, 41, 163
(2004).
V. Cataudella, G. De Filippis, G. Iadonisi, C. A. Perroni, “Variational approach to polarons, Proceedings of the
International School "Enrico Fermi"”, Corso CLXI, 2005.
G. Cantele, C. A. Perroni, V. K. Mukhomorov, D. Ninno, and G. Iadonisi, “Thermodynamical and dynamical
instabilities in the homogeneous polaron gas, Proceedings of the International School "Enrico Fermi"”, Corso
CLXI, 2005.
C. A. Perroni, V. Cataudella, G. De Filippis, G. Iadonisi, and V. M. Ramaglia, “Infrared absorption in polaronic
systems, Proceedings of the International School "Enrico Fermi"”, Corso CLXI, 2005.
23
24
25
26
S. Ossicini, E. Degoli, F. Iori, E. Luppi, R. Magri, G. Cantele, F. Trani, and D. Ninno, “Simultaneously P- and
B-doped silicon nanoclusters: Formation energies and electronic properties”, Appl. Phys. Lett. 87, 173120
(2005).
27
G. Iadonisi, V. K. Mukhomorov, G. Cantele and D. Ninno, “Criteria for the appearence of a periodical
component in the polaron distribution function”, Phys. Rev. B 72, 094305 (2005).
28
G. Cantele, E. Degoli, E. Luppi, R. Magri, D. Ninno, G. Iadonisi and S. Ossicini, “A first-principle study of nand p-doped silicon nanoclusters”, Phys. Rev. B 72, 113303 (2005).
F. Trani, G. Cantele, D. Ninno and G. Iadonisi, Tight binding calculation of the optical absorption cross section
of spherical and ellipsoidal silicon nanocrystals Phys. Rev. B 72, 075423 (2005).
29
30
F. Trani, G. Cantele, D. Ninno, and G. Iadonisi, “Tight binding calculations for the optical properties of
ellipsoidal silicon nanocrystals”, Phys. stat. sol. (c) 2, 3435 (2005).
31
G. Cantele, E. Degoli, E. Luppi, R. Magri, D. Ninno, O. Bisi, S. Ossicini and G. Iadonisi, “Electronic,
structural and optical properties of hydrogenated silicon nanocrystals: the role of the excited states” Phys. stat.
sol. (c) 2, 3263 (2005).
32
E. Degoli, S. Ossicini, G. Cantele, E. Luppi, R. Magri, D. Ninno and O. Bisi, “Formation energies of silicon
nanocrystals: role of dimension and passivation” Phys. stat. sol. (c) 2, 3354 (2005).
33
G. Festa, M. Cossi, V. Barone, G. Cantele, D. Ninno and G. Iadonisi, “A first-principle study of the adsorption
of 1-amino-3-cyclopentene on the (100) silicon surface” J. Chem. Phys. 122, 184714 (2005).
E. Luppi, E. Degoli, G. Cantele, S. Ossicini, R. Magri, D. Ninno, O. Bisi, O. Pulci, G. Onida, M. Gatti, A. Incze
and R. Del Sole, “The Electronic and Optical Properties of Silicon Nanoclusters: Absorption and Emission”
Opt. Mater. 27, 1008 (2005).
E. Degoli, G. Cantele, E. Luppi, R. Magri, S. Ossicini, D. Ninno, O. Bisi, G. Onida, M. Gatti, A. Incze, O. Pulci,
and R. Del Sole, “Ab-initio Calculations of the Electronic Properties of Silicon Nanocrystals: Absorption,
Emission, Stokes Shift” in: AIP Conf. Proc. 772, 859 (2005) (27th International Conference on the Physics of
Semiconductors, edited by J. Menéndez and C.G. Van de Walle).
S. Ossicini, O. Bisi, G. Cantele, E. Degoli, R. Del Sole, M. Gatti, A. Incze, F. Iori, E. Luppi, R. Magri, D.
Ninno, G. Onida, O. Pulci, “Ab-initio calculations of the electronic properties of hydrogenated and oxidized
silicon nanocrystals: ground and excited states”, in: Atti del XVII Congresso dell'Associazione Italiana del
Vuoto, Editrice Compositori (2005).
34
35
36
International journals – Yet unpublished papers
1
S. Ossicini, F. Iori, E. Degoli, E. Luppi, R. Magri, R. Poli, G. Cantele, F. Trani, and D. Ninno, “Understanding
Doping in Silicon Nanostructures”, submitted to Ieee Journal Of Selected Topics In Quantum Electronics On
Silicon Photonics.
2
L. E. Ramos, E. Degoli, G. Cantele, S. Ossicini, D. Ninno, J. Furthmuller, and F. Bechstedt “Effects of size and
shape on doping of Si nanocrystallites”, submitted to Phys. Rev. B.
3
D. Ninno, F. Trani, G. Cantele, K. J. Hameeuw, G. Iadonisi, E. Degoli, S. Ossicini, “Microscopic Description of
Point Charge Screening in Semiconductor Nanocrystals”, submitted to Europhys. Lett.
K. J. Hameeuw, G. Cantele, D. Ninno, F. Trani, G. Iadonisi, The stoichiometric TiO2 (110) surface: obtaining
converged structural properties from first principles calculations. J. Chem. Phys, (2005). In press.
4
EX 4
International journals - Published and Submitted papers
1
F. Bloisi, G. di Blasio, L. Vicari, M. Zoncheddu, “Laser Cleaning for Cultural Heritage”, Nova Science
Publishers, 1-59454-859-5 (2006).
LECTURES Author
Institution
Date
Dr. Fabrizio Bobba
Dipartimento di Fisica, Università degli Studi di Salerno “E.R. Caianiello”, Italy
26/05/2004
Title
Prof. J.M. Triscone
Title
Dr. Marco Aprili
Title
Dr. Vladimir Belotelov
Title
Prof. Ivan Schuller
Title
Dr. Luigi Frunzio
Title
Prof. Paolo Scardi
Title
Dr. Vikass Monebhurrun
Title
Dr. Vittorio Pellegrini
Title
Prof. Marc Anglada
Title
Dr. Annalisa Bruno
Title
Prof. Igor A.Sukhoivanov
Title
Dr. Takuya Satoh
Title
Dr. Francesca Ferlaino
Title
Dr. Denis Grebenkov
Title
Prof. Umberto Scotti di
Uccio
Title
Dr. Nathascia Lampis
Title
STM miscroscopy on conventional superconductors
DPMC, University of Geneva, Switzerland
24/06/2004
Electric Field Effect in Correlated Oxides
CSNSM-CNRS, Université Paris-Sud, Orsay, France
26/10/2004
Superconduttività pi
M.V. Lomonosov, Moscow State University, Russia
24/11/2004
Optics and magneto-optics of nanostructures
University of California, USA
10/12/2004
Confined Structures and the Proximity Effect
Department of Applied Physics,Yale University, USA
16/12/2004
Circuit Quantum Electrodynamics: Doing Quantum Optics on a Chip
Dipartimento di Ingegneria dei Materiali e Tecnologie Industriali,
Università di Trento, Italy
15/02/2005
Diffraction Analysis of Imperfect Materials
CRS Supelec Paris (France)
Numerical Modelling of Eddy Current non-destructive evaluation
of multi-layered planar structures (using the volume integral method)
29/04/2005
NEST – Scuola Normale Superiore di Pisa, Italy
Nuove fasi elettroniche ed eccitoniche nei semiconduttori a bassa dimensionalità:
evidenze nella diffusione anelastica di luce
Universitat Politècnica de Catalunya - ETSEIB
Barcelona (Spain)
03/05/2005
16/05/2005
Structural Integrity, Micromechanics and Reliability of Materials
CRdC“Analisi e Monitoraggio del Rischio Ambientale”, Napoli, Italy
Time resolved fluorescence polarization anisotropy of
combustion-generated nanoparticles
09/06/2005
National University of Radio Electronics, Kharkov. Ukraine
15/06/2005
Modelling of photonic elements for telecommunication application
Max-Born Institut, Berlino (Germany)
27/06/2005
Interface second-harmonic generation from manganite heterostructures
LENS – European Laboratory for Non-Linear Spectroscopy, Italy
28/06/2005
Interactions in a Fermi-Bose mixture of ultracold atoms
Laboratoire de Physique de la Matière Condensee Ecole Polytechnique
Palaiseau, France
Laplacian Transport towards Irregular Interfaces:
A Theoretical, Numerical and Experimental Study
Coherentia-CNR-INFM e DiMSAT Università di Cassino, Italy
01/07/2005
15/07/2005
Proprietà elettroniche, strain e disordine in film sottili di La0.7Sr0.3Mn0.3-d
Dipartimento di Fisica – Università degli Studi di Cagliari, Italy
Proprietà e caratterizzazione strutturale di ossidi magnetici
15/07/2005
Dr. Vladimir Belotelov
Title
Prof. Annalisa Bonfiglio
Title
Prof. Xiaoxing Xi
Title
Prof. Assa Auerbach
Title
Dr. Istvan Jànossy
M.V. Lomonosov, Moscow State University, Russia
27/07/2005
Magnetophotonic crystals: properties and possible applications
INFM-S3 & Dipartimento di Ingegneria Elettronica, Università di Cagliari. Italy
26/09/2005
Substrate-free structures of OTFTs: a perspective for new field effect based devices
Department of Physics and Department of Materials Science and Engineering,
The Pennsylvania State University
28/09/2005
MgB2 thin films and Josephson junctions
Technion University – Haifa, Israel
03/10/2005
Tunneling of vortices in two-dimensional superfluids and superconductors
Research Institute for Solid State Physics and Optics
Hungarian Academy of Sciences, Budapest, Hungary
13/10/2005
Azimuthal anchoring and gliding of liquid crystals on polymers
Prof. Robert B. Laughlin
Università di Stanford e KAIST (Seul)
26/10/2005
Remarking physics from the bottom down: the search for the real frontier
Dr. Angela Vella
Université de Rouen, France
27/10/2005
La sonda atomica laser: potenzialità e questioni aperte
Prof. Anatoli S.Sidorenko
Institute of Applied Physics, Kishinev, Moldova
04/11/2005
Resistive transitions broadening in superconducting MgB2
Dr. Gabriele Campagnano
Technische Universiteit, Delft, Germany
24/11/2005
Weak localization and the Distribution Function of Transmission Eigenvalues
Prof. Emanuele Rimini
Dipartimento di Fisica ed Astronomia, Università di Catania, Italy
06/12/2005
Nanotecnologie in Silicio: dai materiali ai dispositivi
Prof. Ruggero Micheletto
Prof. A.S. Mishchenko
Kyoto University, Japan
Introduzione allo Scanning Near field Optical Microscopi (SNOM)
e sue applicazioni presso la Kyoto University in Giappone
CREST, Japan Science and Technology Agency (JST), Tsukuba, Japan
and
RRC – Kurchatov Institute, Moscow, Russia
Polaron and polaronic metal in high temperature superconductors:
Insights from exact quantum Monte Carlo analysis
14/12/2005
19/12/2005