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Article
Open AccessA precursor mechanism triggering the second magnetization peak phenomenon in superconducting materials
The correlation in type-II superconductors between the creep rate S and the Second Magnetization Peak (SMP) phenomenon which produces an increase in Jc, as a function of the field (H), has been investigated at di...
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Article
Improvements of high-field pinning properties of polycrystalline Fe(Se,Te) material by heat treatments
We present the fabrication of FeSe0.5Te0.5 polycrystalline samples by self-flux method, showing the presence of the peak-effect in the vortex lattice configuration. To improve the performances at high magnetic fi...
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Article
Effects of the Third Harmonic Demagnetization Field on the ac Losses of a Granular FeSeTe Superconductor in ac Field
The first harmonics of the magnetic response, of inter- and intragranular volume fractions of a FeSe0.5Te0.5 granular superconducting sample in an alternate magnetic field, have been numerically extracted from th...
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Article
Determination of the Transition Temperature of a Weak Ferromagnetic Thin Film by Means of an Evolution of the Method Based on the Arrott Plots
The ferromagnetic transition temperature (T c) of a weak ferromagnetic thin film Cu0.38Ni0.62 has been estimated by using an evolution of the Belov, Goriaga, and Arrott (BGA) model. In fact, the t...
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Article
Phase-I dose finding and pharmacokinetic study of the novel hydrophilic camptothecin ST-1968 (namitecan) in patients with solid tumors
Purpose: This is a first-in-human, phase I, dose-escalation study to determine the maximum tolerated dose (MTD) of intravenous, flat-dosed ST-1968 (namitecan), a new hydrophilic camptothecan deri...
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Article
Non-linear Flux Flow Resistance of Type-II Superconducting Films
We analyze the flux-flow (FF) regime in type-II superconducting films exhibiting quite strong pinning. By driving the vortex lattice (VL) up to high dissipative states, the moving VL undergoes an instability, ...
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Article
Granularity and Linear Flux Dynamics in Sintered LaO0.92F0.08FeAs
The flux dynamics in LaO0.92F0.08FeAs polycrystalline samples has been investigated looking at the first and higher harmonics of the AC magnetic susceptibility. The investigation of the real and imaginary part of...
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Article
Third harmonics of the AC magnetic susceptibility: a method for the study of flux dynamics in high temperature superconductors
The temperature dependence of the 1st and 3rd harmonics ( \(\chi^{\prime ,\prime\prime}_{1,3}\) ) of the AC magnetic susceptibility has been measured on melt grown YBCO samples for...
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Article
Low frequency transport measurements in
Low frequency transport measurements are performed on GdSr2RuCu2O8 pellets. The observed current-voltage curves are qualitatively explained in the framework of a simple phenomenological model accounting for coexi...
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Article
Crystal structure and morphology of the NdSr 2 RuCu 2 O y compound
We report the preparation and the structural and morphological characterization of the perovskite compound NdSr2RuCu2Oy. The crystal structure of this material has been determined by a combined high-resolution el...
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Chapter
Structure and Morphology of NdSr2RuCu2O y and GdSr2RuCu2Oz
The structural and morphological properties of the NdSr2RuCu2Oy (Nd1212) compound, which has been recently synthesized as a pure perovskite phase, are reported and compared with the properties of the magnetic sup...
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Article
Supercritical antisolvent precipitation: A new technique for preparing submicronic yttrium powders to improve YBCO superconductors
The solvent, supercritical antisolvent technique (SAS) has been used to produce submicronic particles of yttrium acetate for the synthesis of YBCO superconductors. For this purpose, in a continuous SAS apparat...
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Article
High-rate melt processed Sm1Ba2Cu3O7-x bulk superconductor
Samarium element has been substituted to yttrium in Y123 superconducting melt textured bulk samples in order to make the whole fabrication process much faster. A preliminary comparison between directionally so...
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Article
Cubic structures of Josephson coupled superconducting spheres: Three-dimensional models of granular superconductors
The magnetic response of a simple three-dimensional Josephson junction network is studied. The model network represents the circuital equivalent of a physical system consisting of eight spherical grains locate...
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Article
Dissipative effects near the transition temperature of high Tc superconductor
The complex magnetic susceptibility of oxide superconductors near the transition temperature has been computed as a function of temperature and frequency by numerical solution of the non linear, flux diffusion...
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Article
AC susceptibility measurements on directionally solidified YBCO samples
Measurements of χt’ and χt" have been performed on directionally solidified YBCO 211 doped samples. We analyze the variations of structural and superconducting properties as a function of a relevant fabricatio...
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Article
Magnetic field behavior of resonant current steps in one dimensional arrays of Josephson tunnel junctions
We study the magnetic field behavior of the resonant current steps appearing in one dimensional arrays of Josephson tunnel junctions. The analysis is carried out in the framework of the Kulik theory of resonan...
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Article
A study of the d.c. susceptibility of granular superconductors by means of Josephson-junction array models
The field-cooled d.c. susceptibility of granular superconductors is studied by means of simple Josephson-junction array models. It is shown that a paramagnetic behaviour after field cooling for these systems, ...
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Chapter and Conference Paper
Hot spots in Solar Cells. Test Procedures and Study of Related Phenomena
An indoor hot spot test procedure for photovoltaic modules is described.Test procedures for different cell interconnection circuits, from simple series connected strings to more complex series-parallel configu...
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Article
Displaced linear slope and fluxon dynamics in large, one-dimensional Josephson junctions
A displaced linear slope (DLS) appears under particular conditions in the current-voltage characteristic of large Josephson tunnel junctions. The significant features that enable one to distinguish the DLS fro...
