Symmetry of the remanent state flux distribution in superconducting thin strips: Probing the critical state

Details Symmetry of the remanent state flux distribution in superconducting thin strips: Probing the critical state Symmetry of the remanent state flux distribution in superconducting thin strips: Probing the critical state

2000-12-27

arxiv.org/abs/cond-mat/0012476v1

Phys. Rev. B 63, 184510 (2001)

Physics

Condensed Matter

Superconductivity

5 pages including 5 eps figures, submitted to PRB

Scientific paper

10.1103/PhysRevB.63.184510

The critical-state in a thin strip of YBaCuO is studied by magneto-optical imaging. The distribution of magnetic flux density is shown to have a specific symmetry in the remanent state after a large applied field. The symmetry was predicted [PRL 82, 2947 (1999)] for any Jc(B), and is therefore suggested as a simple tool to verify the applicability of the critical-state model. At large temperatures we find deviations from this symmetry, which demonstrates departure from the critical-state behavior. The observed deviations can be attributed to an explicit coordinate dependence of $j_c$ since both a surface barrier, and flux creep would break the symmetry in a different way.

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