Critical state in type-II superconductors of arbitrary shape

Details Critical state in type-II superconductors of arbitrary shape Critical state in type-II superconductors of arbitrary shape

2004-12-16

arxiv.org/abs/cond-mat/0412453v1

Physics

Condensed Matter

Superconductivity

4 pages, 1 figure, appears in Phys. Rev. B 71, issue 1 (2005)

Scientific paper

10.1103/PhysRevB.71.012510

The well-known Bean critical state equations in general are not sufficient to describe the critical state of type-II superconductors when the sample shape is not symmetric. We show how one can find the critical state in superconductors of arbitrary shape. Analyzing a simple example of nonsymmetry, we demonstrate that in the general case, a perturbation of the current distribution in the critical state propagates into the sample smoothly in a diffusive way. This is in contrast to the usual Bean critical state where the current distribution changes abruptly at a narrow front.

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