| Issue |
Europhys. Lett.
Volume 34, Number 4, May I 1996
|
|
|---|---|---|
| Page(s) | 287 - 292 | |
| Section | Condensed matter: electronic structure, electrical, magnetic and optical properties | |
| DOI | https://doi.org/10.1209/epl/i1996-00452-6 | |
| Published online | 01 September 2002 | |
Self-organized criticality effect on stability: magneto-thermal oscillations in a granular YBCO superconductor
1
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
Received:
15
January
1996
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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