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Vortex dynamics during N–S and S–N transitions of Y–Ba–Cu–O superconductors under the effect of temperature gradient and thermal cycling

Published online by Cambridge University Press:  31 January 2011

I. Kirschner ,
A. C. Bódi ,
R. Laiho  and
L. Lähderanta
I. Kirschner*
Affiliation:
Department for Low Temperature Physics, Eötvös University, H-1088 Budapest, Hungary
A. C. Bódi
Affiliation:
Institute of Experimental Physics, Kossuth University, H-4001 Debrecen, Hungary
R. Laiho
Affiliation:
Wihuri Physical Laboratory, University of Turku, FIN-20500 Turku, Finland
L. Lähderanta
Affiliation:
Wihuri Physical Laboratory, University of Turku, FIN-20500 Turku, Finland
*
a)Author to whom correspondence should be addressed at Eötvös University, Department of Low Temperature Physics, H-1088 Budapest, Puskin u. 5-7., Hungary; phone: (++36-1) 266-7929, fax: (++36-1) 266-0206.
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Abstract

AC susceptibility of ac has been measured simultaneously in three different ranges of Y–Ba–Cu –O ceramic samples in the presence of a large and variable temperature gradient. The results obtained for normal-superconducting or superconducting-normal transitions under the effect of the one-dimensional nonequilibrium temperature distribution reveal the vortex motion to consist of not only conventional flux expulsion (or flux penetration), but flux exchange too, appearing between different ranges of samples and between samples and their close physical environment. The thermal cycles are shown to represent a supplementary heat treatment, increasing the homogeneity of the sample and decreasing the pinning, which accelerate the process of vortex motion.

Type
Articles
Information
Journal of Materials Research , Volume 12 , Issue 11 , November 1997 , pp. 3090 - 3098
Copyright
Copyright © Materials Research Society 1997

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