Current profiles and AC losses of a superconducting strip with elliptic cross-section in perpendicular magnetic field

Details Current profiles and AC losses of a superconducting strip with elliptic cross-section in perpendicular magnetic field Current profiles and AC losses of a superconducting strip with elliptic cross-section in perpendicular magnetic field

2002-06-13

arxiv.org/abs/cond-mat/0206229v1

Physics

Condensed Matter

Superconductivity

12 pages; 3 figures

Scientific paper

The case of a hard type II superconductor in the form of strip with elliptic cross-section when placed in transverse magnetic field is studied. We approach the problem in two steps, both based on the critical-state model. First we calculate numerically the penetrated current profiles that ensure complete shielding in the interior, without assuming an a priori form for the profiles. In the second step we introduce an analytical approximation that asumes that the current profiles are ellipses. Expressions linking the sample magnetization to the applied field are derived covering the whole range of applied fields. The theoretical predictions are tested by the comparison with experimental data for the imaginary part of AC susceptibility.

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