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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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Published in: | Physica. C, Superconductivity Superconductivity, 1998-12, Vol.309 (1), p.120-130 |
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Main Authors: | , , , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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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. |
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ISSN: | 0921-4534 1873-2143 |
DOI: | 10.1016/S0921-4534(98)00535-8 |