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Featured researches published by S. Senoussi.


Physical Review B | 2006

Interplay between the glassy transition and granular superconductivity in organic materials

S. Senoussi; A. Tirbiyine; A. Ramzi; A. Haouam; F. Pesty

It is known that some (BEDT-TTF)2X layered organic superconductors undergo a glassy transition near 80 K. Our purpose is to exploit quenched disorder to get new insights on both the superconducting state (T < 12 K) and the glassy transition by studying the superconducting properties as functions of annealing time (ta) and temperature (Ta) around 80 K. The main results on the fully deuterated kappa-(BEDT-TTF)2Cu[N(CN)2]Br compound are: 1) The data can be described by a percolation cluster model. 2) At short time scales, the clusters grow with ta following a power law. 3) At large time scales the clusters grow toward a thermodynamic state following a stretched exponential law in (1 - exp(-(t/tau)beta)with beta varying from about 0.5 to 1 in our Ta range (65 - 110 K). 4) The relaxation time follows an Arrhenius law tau(T)=tau0exp(U/T) with U around 2660 K and 1/tau0 around 2x1013 s-1. 5) The asymptotic magnetization fits with a scaling law with Tg around 55K and n around 3.2. The results are consistent with a Ising spin-glass-like model.


Archive | 2006

Anisotropy of the Critical Current Density in High Quality YBa2Cu3O7−δ Thin Film

A. Taoufik; A. Tirbiyine; A. Ramzi; S. Senoussi

We have investigated the transport critical current density J c as a function of the angle θ between the crystallographic c-axis and the applied magnetic field in high quality YBa2Cu3O7−δ thin film. Measurements were performed for various temperature and magnetic field values. Our results show that the critical current density maximum occurs when the applied magnetic field is parallel to the ab planes (θ = 90°). The angular dependence of the critical current density shows the existence of the intrinsic pinning between the CuO2 layers for H parallel to the ab planes and the extrinsic pinning in the configuration where the magnetic field is parallel to the c-axis. We have analyzed our results in the framework of the intrinsic pinning model proposed by Tachiki and Takahachi


Physica Status Solidi (c) | 2006

Granular-percolative superconductivity in organic materials: comparison with HTSC ceramics

S. Senoussi; F. Pesty; A. Ramzi; A. Tirbiyine; A. Haouam; A. Taoufik; Claude Pasquier


Physica A-statistical Mechanics and Its Applications | 2005

The critical current density Jc in high quality YBa2Cu3O7-δ thin films

A. Ramzi; A. Taoufik; S. Senoussi; A. Tirbiyine; A. Abaragh


Physica Status Solidi (c) | 2006

Analysis of the noise voltage in high-Tc superconducting thin films

A. Labrag; M. Bghour; A. Abaragh; A. Bouaaddi; A. Ramzi; A. Taoufik; S. Senoussi; A. Tirbiyine


Physica Status Solidi (c) | 2006

Formation of the magnetization loops of high‐Tc superconductors

A. Abaragh; A. Taoufik; A. Ramzi; S. Senoussi; A. Labrag; M. Bghour; A. Bouaaddi; A. Tirbiyine


Physica Status Solidi (c) | 2006

Determination of the pinned vortex fraction in type-II superconductors

A. Bouaaddi; A. Taoufik; A. Labrag; M. Bghour; A. Abaragh; A. Ramzi; S. Senoussi


Physica Status Solidi (c) | 2006

Irreversibility line and critical current studies in κ‐(BEDT‐TTF)2Cu[N(CN)2]Br organic superconductor: effect of the structural transformation near 80 K

A. Tirbiyine; S. Senoussi; A. Taoufik; A. Ramzi; A. Haouam; A. Labrag


Physica Status Solidi (c) | 2006

Fishtail effect in twinned and detwinned YBCO single crystals

M. Boudissa; R. Halimi; K. Frikach; S. Senoussi


Physica Status Solidi (c) | 2006

Correlation between the critical current and the structural transformation near 80 K in the organic superconductor κ-(BEDT-TTF)2Cu[N(CN)2]Br

A. Tirbiyine; S. Senoussi; F. Pesty; A. Taoufik; A. Ramzi; A. Labrag

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F. Pesty

University of Paris-Sud

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K. Frikach

University of Paris-Sud

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