Excess Conductivity of Anisotropic Inhomogeneous Superconductors Above the Critical Temperature

The theoretical model of conductivity of a layered anisotropic normal metal containing small superconducting ellipsoidal granules with an arbitrary ratio of semiaxes is developed. Calculation data obtained under two simple approximations (self-consistent and Maxwell) are compared. The results may be...

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Bibliographic Details
Published in:Physics of the solid state 2019-09, Vol.61 (9), p.1549-1552
Main Authors: Mogilyuk, T. I., Grigoriev, P. D., Kesharpu, K. K., Kolesnikov, I. A., Sinchenko, A. A., Frolov, A. V., Orlov, A. P.
Format: Article
Language:English
Subjects:
Anisotropy
Critical temperature
Electric bridges
Electric properties
Granular materials
Physics
Physics and Astronomy
Solid State Physics
Superconductivity
Superconductors
Temperature
Temperature dependence
Thickness
Transition temperature
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Summary:The theoretical model of conductivity of a layered anisotropic normal metal containing small superconducting ellipsoidal granules with an arbitrary ratio of semiaxes is developed. Calculation data obtained under two simple approximations (self-consistent and Maxwell) are compared. The results may be applied in the analysis of the observed temperature dependence of the conductivity anisotropy in various anisotropic superconductors with the superconducting phase emerging in the form of isolated superconducting granules. The temperature dependence of the electric resistance along and across the conducting layers above and near the superconducting transition temperature is studied experimentally for bridge structures of a varying thickness. It is demonstrated that this resistance and even the effective superconducting transition temperature depend strongly on the bridge thickness (i.e., the number of layers through which the electric current flows). Note that significant differences were observed only for the resistance across the layers.
ISSN:1063-7834
1090-6460
DOI:10.1134/S1063783419090166