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Double-step behavior of the critical current vs. magnetic field in a metal ceramic: theory

A new model is developed todescribe the phsyics of a strong magnetic filed H influence on the high-T c metal ceramic critical current J c. The point is that in the most general case the J c(H) value is determined by the magnitude of a surface current j sf induced in the granules. The basic idea of t...

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Bibliographic Details
Published in:Physica. C, Superconductivity Superconductivity, 1994-12, Vol.235, p.3087-3088
Main Author: D'yachenko, A.I.
Format: Article
Language:English
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Summary:A new model is developed todescribe the phsyics of a strong magnetic filed H influence on the high-T c metal ceramic critical current J c. The point is that in the most general case the J c(H) value is determined by the magnitude of a surface current j sf induced in the granules. The basic idea of the model is that the surface current density j sf is the sum of two components j sf=j m+j g. In the Meissner state j m is a diamagnetic (equilibrium) surface shielding current. In the mixed state j g is induced intragrain current whose sign depends on the magnetic history.
ISSN:0921-4534
1873-2143
DOI:10.1016/0921-4534(94)91070-7