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Hysteretic Dependence of Critical Current on Applied Magnetic Field and Magnetic Irreversmujty Line Crossings in Polycrystalline YBa2Cu3C7

Published online by Cambridge University Press:  28 February 2011

Thomas R. Askew  and
Richard B. Flippen
Thomas R. Askew
Affiliation:
E. I. Du Pont de Nemours & Company, Central Research and Development, P.O. Box 80357, Wilmington, DE 19880–0357
Richard B. Flippen
Affiliation:
E. I. Du Pont de Nemours & Company, Central Research and Development, P.O. Box 80357, Wilmington, DE 19880–0357
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Abstract

The transport critical current density Jc has been measured in high quality poly-crystalline YBa2Cu3C7 as a function of temperature and for various sweeps of sub-Tesla applied magnetic fields. Large increases over the virgin response were observed in Jc at fields of a few hundred gauss and are attributed to trapped flux in the samples. The amount of trapped flux was measured and correlated to the change at Jc at various temperatures. The position of the magnetic irreversibility line was measured by field induced absorption shift in AC susceptibility. The various data are discussed in the context of the weak link conduction model.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 169: Symposium M – High Temperature Superconductors: Fundamental Properties and Novel Materials Processing , 1989 , 939
Copyright
Copyright © Materials Research Society 1990

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