Symmetry of the remanent-state flux distribution in superconducting thin strips: Probing the critical state - art. no. 184510

Citation
Av. Bobyl et al., Symmetry of the remanent-state flux distribution in superconducting thin strips: Probing the critical state - art. no. 184510, PHYS REV B, 6318(18), 2001, pp. 4510
Citations number
25
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
PHYSICAL REVIEW B
ISSN journal
01631829 → ACNP
Volume
6318
Issue
18
Year of publication
2001
Database
ISI
SICI code
0163-1829(20010501)6318:18<4510:SOTRFD>2.0.ZU;2-P
Abstract
The critical-state in a thin strip of YBa2Cu3O7-delta a is studied by magne to-optical imaging. The distribution of magnetic flux density is shown to h ave a specific symmetry in the remanent state after a large applied field. The symmetry was predicted [Phys. cRev. Lett. 82, 2947 (1999)] for any j(c) (B), and is therefore suggested as simple tool to verify the applicability of the critical-slate model. At large temperatures we find deviations from this symmetry, which demonstrates a departure from the critical-state behav ior. The observed deviations can be attributed to an explicit coordinate de pendence of j(c) since both a surface barrier and flux creep would break th e symmetry in a different way.