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

Abstract

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.

5 pages including 5 eps figures, submitted to PRB

References in corpus (4)

• Where does the transport current flow in Bi2Sr2CaCu2O8 crystals?
• Central peak position in magnetization loops of high-$T_c$ superconductors
• Exact Solution for the Critical State in Thin Superconductor Strips with Field Dependent or Anisotropic Pinning
• Spatially-resolved studies of chemical composition, critical temperature, and critical current density of YBaCuO thin film

Cited by in corpus (1)

• Diamond Magnetometry of Meissner Currents in a Superconducting Film