Flux penetration in a superconducting strip with an edge indentation

[摘要] The flux penetration near a semicircular indentation at the edge of a thin superconducting strip placed in a transverse magnetic field is investigated. The flux front distortion due to the indentation is calculated numerically by solving the Maxwell equations with a highly nonlinear E(j) law. We find that the excess penetration Delta can be significantly (similar to 50%) larger than the indentation radius r(0), in contrast to a bulk superconductor in the critical state where Delta=r(0). It is also shown that the flux creep tends to smoothen the flux front, i.e., reduce Delta. The results are in very good agreement with magneto-optical studies of flux penetration into an YBa2Cu3Ox film having an edge defect.

[发布日期] 2007-11-01

[关键词] FIELD;PATTERNS;FILMS