Anisotropic energy dissipation, flux flow and topological pinning in ceramic superconductors
- 1 January 1992
- journal article
- Published by IOP Publishing in Superconductor Science and Technology
- Vol. 5 (1S) , S276-S279
- https://doi.org/10.1088/0953-2048/5/1s/061
Abstract
The dissipation in the high Tc ceramic superconductor La1.85Sr0.15CuO4- delta is interpreted in terms of interacting magnetic flux systems: vortices in the ceramic grains and fluxons between them. In zero field cooling experiments the dissipation shows a sin2 Theta dependence, where Theta is the angle between current and field. This result and the existence of an angle independent critical current are analyzed in the framework of a granular system where the dissipation is due to two contributions, one induced by movement of magnetic flux and the other associated to dissipation in the junctions.Keywords
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