Volume 34, Number 4, May I 1996
|Page(s)||287 - 292|
|Section||Condensed matter: electronic structure, electrical, magnetic and optical properties|
|Published online||01 September 2002|
Self-organized criticality effect on stability: magneto-thermal oscillations in a granular YBCO superconductor
Groupe de Physique des Solides, Unité 17
Associée au CNRS, Universités Paris 6 et Paris 7 - Tour 23,
2 place Jussieu, 75251 Paris Cedex 5, France
2 School of Physics and Astronomy, Raymond and Beverly Sackler Faculty of Exact Sciences, Tel Aviv University - Tel Aviv 69978, Israel
3 Laboratoire Léon Brillouin, CEN-Saclay - 91191 Gif-sur-Yvette Cedex, France
4 DRFMC, CEA/Grenoble - 17 rue des Martyrs, 38054 Grenoble Cedex 9, France
Accepted: 17 March 1996
We show that the self-organized criticality of Bean's state in each of the grains of a granular superconductor results in magneto-thermal oscillations. We find that the frequency of these oscillations is proportional to the external magnetic field sweep rate and is inversely proportional to the square root of the heat capacity. We demonstrate experimentally and theoretically that this dependence is influenced mainly by the granularity of the superconductor.
PACS: 74.60.Ge – Flux pinning, flux creep, and flux-line lattice dynamics / 74.72.Bk – Y-based compounds / 74.80.Bj – Granular, melt-textured, and amorphous superconductors; powders
© EDP Sciences, 1996
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