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Electromagnetic properties of brickwork-like structured hard superconductors

The low-frequency surface impedance of melt-textured hard superconductors is studied both theoretically and experimentally. The electrodynamic properties of these materials can be described by a simple model which takes into account their brickwork-like structure. This model represents a generalizat...

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Bibliographic Details
Published in:Physica. C, Superconductivity Superconductivity, 1998-12, Vol.309 (1), p.120-130
Main Authors: Fisher, L.M., Savel'ev, S.E., Voloshin, I.F., Yampol'skii, V.A., Shaw, D.T.
Format: Article
Language:English
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Summary:The low-frequency surface impedance of melt-textured hard superconductors is studied both theoretically and experimentally. The electrodynamic properties of these materials can be described by a simple model which takes into account their brickwork-like structure. This model represents a generalization of the critical-state for a situation where the main pinning of the vortex system is affected by intercrystalline boundaries. An experimental confirmation of our model is presented. The main result consists in a theoretical prediction of a quasibarrier preventing the penetration of an ac magnetic flux into a melt-textured superconductor. A contactless method to determine the nonuniform spatial distribution of the critical current density caused by nonuniform pinning is proposed.
ISSN:0921-4534
1873-2143
DOI:10.1016/S0921-4534(98)00535-8