A5066984479- Physics of Superconductivity and Magnetism
- Superconducting Materials and Applications
- Advanced Condensed Matter Physics
- Magnetic and transport properties of perovskites and related materials
- Iron-based superconductors research
- Magnetic properties of thin films
- Superconductivity in MgB2 and Alloys
- Superconducting and THz Device Technology
- Particle accelerators and beam dynamics
- Rare-earth and actinide compounds
- Atomic and Subatomic Physics Research
- Magnetic confinement fusion research
- History and Developments in Astronomy
- Various Chemistry Research Topics
- Spacecraft and Cryogenic Technologies
- Theoretical and Computational Physics
- Magnetic Properties and Applications
- Molecular Junctions and Nanostructures
- Spectroscopy and Laser Applications
- Electronic and Structural Properties of Oxides
- Surface and Thin Film Phenomena
- Medieval European Literature and History
- Electron and X-Ray Spectroscopy Techniques
- Adaptive optics and wavefront sensing
- CCD and CMOS Imaging Sensors
Superconducting and other Innovative Materials and Devices Institute
2018-2025
University of Salerno
2015-2024
University of Sannio
2018-2023
Observatoire Midi-Pyrénées
1986
Among the families of iron-based superconductors, 11-family is one most attractive for high field applications at low temperatures. Optimization fabrication processes bulk, crystalline and/or thin film samples first step in producing wires tapes practical power conductors. Here we present results a comparative study pinning properties iron-chalcogenides, investigating flux mechanisms optimized Fe(SeTex) and FeSe by current–voltage characterization, magneto-resistance magnetization...
In the frame of EU Next Generation Europe program, Italian Minister University and Research has approved IRIS project (Innovative Infrastructure for applied Superconductivity). will be active in six poles. The poles are spread all over Italy: Milano, hub infrastructure; Genova, Frascati, Napoli, Salerno, Lecce. scope is to provide an infrastructure accompany development superconductivity basic research like accelerators. It also aims at developing societal applications superconductivity,...
In the frame of Next Generation Europe program, EU program to boost after-covid recovery, Italian Minister University and Research has funded a project called IRIS (Innovative Infrastructure for applied Superconductivity). New laboratories will be built or upgraded in six poles: Milan (hub infrastructure), Genoa, Frascati, Naples, Salerno Lecce, carry out basic research on magnetism superconducting materials, test wires, tapes large current cables, magnets construction with advanced...
The residual-resistivity ratio (RRR) of the normal-metal matrix is a key parameter for electrical and thermal stability technical superconductors. In Bi2Sr2CaCu2 (Bi-2212) round wires, precursor powders are embedded in Ag without any diffusion barrier, elemental from superconducting filaments into might be expected to contaminate during melt processing required high critical current density development. This work shows that overpressure processing, which adopted enhance performance, improves...
The study of the flux-flow instability in superconducting materials has recently gained renewed attention due to its potential implications for use analyzed as micrometer-sized detectors single photons. values quasiparticle relaxation time (τE) measured these are affected by pinning properties. Here, we report electric transport properties NbReN microstrips different quality. For strip characterized high resistivity, and large critical currents pinning, estimate a value τE that is almost two...
High-temperature superconductivity in cuprate materials is achieved by hole or electron doping of the parent Mott insulator. In this paper, electron-doped Nd <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2-x</sub> Ce xmlns:xlink="http://www.w3.org/1999/xlink">x</sub> CuO xmlns:xlink="http://www.w3.org/1999/xlink">4±δ</sub> films with different content cerium have been grown on (010) SrTiO xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> (TiO...
The stability against quench is one of the main issue to be pursued in a superconducting material which should able perform at very high levels current densities. Here we focus on connection between critical $I_c$ and quenching $I^*$ associated so-called flux-flow instability phenomenon, sets as an abrupt transition from flux flow state normal state. To this purpose, analyze several current-voltage characteristics three types iron-based thin films, acquired different temperature applied...
In a superconducting photon detector, the effective transition to normal state can be induced by instability of flux flow regime. Indeed, in presence self-magnetic field, local suppression superconductivity absorption determines vortex nucleation and regime, which make unstable. Understanding such boost performances those devices based on this resistive switching. Here, we present study geometry influence NbN NbTiN ultrathin films. Despite same patterned microbridge geometry, two...
The improvement in the fabrication techniques of iron-based superconductors have made these materials real competitors high temperature and MgB$_2$. In particular, iron-chalcogenides proved to be most promising for realization current carrying tapes. But their use on a large scale cannot achieved without understanding stability mechanisms compounds. Indeed, we recently observed presence flux flow instabilities features Fe(Se,Te) thin films grown CaF$_2$. Here present results current-voltage...
In superconducting materials a dynamical rearrangement of the vortex lattice occurs by forcing vortices at high velocities, until system can become unstable. This phenomenon is known as instability, in which sudden transition drives abruptly to normal state. We present an experimental study on submicron bridges NbN and NbTiN ultra-thin films with thickness few nanometers. The nanoscale effect instability investigated not only wide bridges, but also changing direction external magnetic field...
We performed a detailed investigation of the superconducting properties polycrystalline Pr
Ultrathin films of the electron-doped compound Nd <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2-x</sub> Ce xmlns:xlink="http://www.w3.org/1999/xlink">x</sub> CuO xmlns:xlink="http://www.w3.org/1999/xlink">4±δ</sub> (NCCO) were realized by dc sputtering technique. The grown both on (001)-oriented SrTiO xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> and nonstoichiometric with Ti-rich defects. Also, NCO parent compound, namely...
Abstract NbxRe1−x is a non-centrosymmetric superconductor recently realized in thin film form. The access to the basic physics that governs this material hindered by polycrystalline structure of films which consist grains small dimensions. In these conditions, are not decisive revealing nature superconducting order parameter, and, particular, possible presence spin-triplet component. work, post-deposition annealing procedures were performed improve crystalline quality as-grown films. As...
Point-contact spectroscopy has been performed on bulk samples of electron-doped high temperature superconductor Nd2-xCexCuO4-. The were characterized by X-ray diffraction and scanning electron microscopy equipped with a wavelength dispersive spectrometer an backscatter detector. Ce content x = 0.15, show the absence spurious phases randomly oriented grains, most which have dimensions approximately 220 µm2. low-bias spectra in tunnelling regime, i.e., transparency interface, exhibit gap...
Point-contact spectroscopy was performed on bulk samples of electron-doped high temperature superconductor Nd2-xCexCuO4-δ. The were characterized using X-ray diffraction and scanning electron microscopy equipped with a wavelength-dispersive spectrometer an backscatter detector. Samples Ce content x = 0.15 showed the absence spurious phases randomly oriented grains, most which had dimensions approximately 220 µm2. low-bias spectra in tunneling regime, i.e., high-transparency interface,...
Several members of the RPt <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">4</sub> Ge xmlns:xlink="http://www.w3.org/1999/xlink">12</sub> skutterudites class (R = Sr, Ba, Th, La, Pr) show at low temperature phenomenon superconductivity, with R Pr exhibiting highest transition about 8 K. PrPt shows as well a wide variety strongly correlated electron behavior, including metal-insulator transitions, spin fluctuations, and various magnetically...
We describe the Point Contact Spectroscopy technique for characterization of superconducting materials. By pushing a metallic tip on surface, it is possible to tune interface properties, from perfect transparent barrier up case insulating separating two electrodes tunnel junction. The experiments can be described in framework Blonder-Tinkham-Klapwijck theory. In this paper, we show both cases, observed different kinds superconductors and compare results with
Nd$_{2-x}$Ce$_x$CuO$_{4\pmδ}$ (NCCO) epitaxial thin films have been deposited on (100) SrTiO$_3$ substrates by DC sputtering technique in different atmosphere. The as-grown samples show dependence of the in-plane resistivity at low temperature, when they are grown pure argon atmosphere or oxygen. Moreover, an unusual behaviour is also found transport takes place presence external magnetic field. It commonly accepted that higher anisotropic properties NCCO crystalline cell with respect to...
Epitaxial ultra-thin films of the electron-doped compound Nd <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2-x</sub> Ce xmlns:xlink="http://www.w3.org/1999/xlink">x</sub> CuO xmlns:xlink="http://www.w3.org/1999/xlink">4±δ</sub> (NCCO) have been fabricated by dc sputtering technique. The NCCO parent compound, namely xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> xmlns:xlink="http://www.w3.org/1999/xlink">4</sub> , has used as buffer layer...
Cooling efficiency and thermal stability is strictly demanding for practical applications of superconductors operating at current values close to the critical current, such as superconducting detectors. Indeed, a thermally unstable device can show premature quench, i.e. it suddenly switch from state normal one value lower than expected one, which result in false counts. by direct contact with liquid He bath considered best way obtain device. Other, cheaper cooling techniques be suitable...