Thin superconducting disk with B-dependent Jc: Flux and current distributions

Details Thin superconducting disk with B-dependent Jc: Flux and current distributions Thin superconducting disk with B-dependent Jc: Flux and current distributions

1999-06-18

arxiv.org/abs/cond-mat/9906297v1

Phys. Rev. B, v.60, p.13112-13118 (1999)

Physics

Condensed Matter

Superconductivity

RevTeX, 7 pages including 8 figures

Scientific paper

10.1103/PhysRevB.60.13112

The critical state in a superconducting thin circular disk with an arbitrary magnetic field dependence of the critical sheet current, Jc(B), is analyzed. With an applied field Ba perpendicular to the disk, a set of coupled integral equations for the flux and current distributions is derived. The equations are solved numerically, and flux and current profiles are presented graphically for several commonly used Jc(B) dependences. It is shown that for small Ba the flux penetration depth can be described by an effective Bean model with a renormalized Jc entering the leading term. We argue that these results are qualitatively correct for thin superconductors of any shape. The results contrast the parallel geometry behavior, where at small Ba the B-dependence of the critical current can be ignored.

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