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Surface Impedance and Granularity in Superconducting Cuprates

Published online by Cambridge University Press:  28 February 2011

J. Halbritter
J. Halbritter*
Affiliation:
Appl. Phys. Stanford University, STANFORD, CA 94305 and Kernforschungszentrum, Postfach 3640, 7500 KARLSRUHE, W.- Germany
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Abstract

The rf residual surface resistance Rres is an important figure of merit for superconducting microwave devices and for establishing the homogeneity of superconducting surfaces. In granular superconductors not only are high residual rf surface resistance values Rres observed, but also strong field dependencies of Rres(T,ω, Hrf) and the penetraton depth λres(T, ω, Hrf) are encountered even at very low field levels (of order 1 Oe). These observations can be explained in terms of granularity consisting of weak links and of insulating interfaces, which provide additional degrees of freedom due to fluxoid motion and electromagnetic strip line modes. These degrees of freedom cause additional interaction mechanisms with applied rf fields.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 195: Symposium S – Physical Phenomena in Granular Materials , 1990 , 391
Copyright
Copyright © Materials Research Society 1990

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References

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