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Etude de l'aimantation irréversible, de la densité de courant critique et de la susceptibilité dans les nouveaux supraconducteurs

Abstract : We report investigations of the low temperature (2 K < T < 15 K) ac susceptibility and the magnetization
of the fully deuterated organic superconductor κ-(BEDT-TTF)2Cu[N(CN)2]Br. Our measurements were
performed after successive annealing at high temperature in the region 65 K < Ta < 110 K where the ethylene molecules undergo some kind of order disorder transition. The annealing time ta was varied from few seconds to about 2×106 s. The superconducting state can be described by a distribution of percolating clusters grown during annealing in the transition region. The spatial structure of such clusters and their relaxation
times (in the transition region) obey essentially the same scaling laws and the same stretched exponential
relaxation as in Ising spin glasses. The data are described by a granular model in which the grain
radius r is equal to the average radius of the clusters. At the lowest fields and temperatures the clusters are
coupled via Josephson junctions.
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https://tel.archives-ouvertes.fr/tel-00106405
Contributor : Abdelaziz Ramzi <>
Submitted on : Sunday, October 15, 2006 - 6:46:08 PM
Last modification on : Wednesday, September 16, 2020 - 4:31:52 PM
Long-term archiving on: : Tuesday, April 6, 2010 - 7:40:16 PM

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Abdelaziz Ramzi. Etude de l'aimantation irréversible, de la densité de courant critique et de la susceptibilité dans les nouveaux supraconducteurs. Supraconductivité [cond-mat.supr-con]. Faculté des Sciences d'Agadir, 2006. Français. ⟨tel-00106405⟩

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