Pinning and the size of grains in high-T sub / c / ceramics

We have investigated the dependence of the intergranular local critical current density j sub(c) on temperature for ceramic YBCO samples using the contactless method based on the measurement of surface impedance of samples. It was found that there is an the unusual behaviour of the function j sub(c)...

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Bibliographic Details
Published in:Solid state communications 1992-01, Vol.81 (12), p.983-988
Main Authors: Fisher, L M, Il'in, N V, Podlevskikh, N A
Format: Article
Language:English
Online Access:Get full text
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Summary:We have investigated the dependence of the intergranular local critical current density j sub(c) on temperature for ceramic YBCO samples using the contactless method based on the measurement of surface impedance of samples. It was found that there is an the unusual behaviour of the function j sub(c)(T). It has a local maximum at some temperature. It was shown that the ratio of maximal difference of energy for different states to the period alpha has a maximum when the parameter alpha is an order of the Josephson penetration depth lambda sub(j). The experimental results can be explained qualitatively on the base of this theory.
ISSN:0038-1098