Mesoscopic Superconducting Disc with Short-Range Columnar Defects

Details Mesoscopic Superconducting Disc with Short-Range Columnar Defects Mesoscopic Superconducting Disc with Short-Range Columnar Defects

1999-01-07

arxiv.org/abs/cond-mat/9901040v3

Physics

Condensed Matter

Superconductivity

14 pgs. RevTex, typos and figures corrected. Submitted to Phys. Rev. B

Scientific paper

10.1103/PhysRevB.59.12039

Short-range columnar defects essentially influence the magnetic properties of a mesoscopic superconducting disc.They help the penetration of vortices into the sample, thereby decrease the sample magnetization and reduce the upper critical field. Even the presence of weak defects split a giant vortex state (usually appearing in a clean disc in the vicinity of the transition to a normal state) into a number of vortices with smaller topological charges. In a disc with a sufficient number of strong enough defects vortices are always placed onto defects. The presence of defects lead to the appearance of additional magnetization jumps related to the redistribution of vortices which are already present on the defects and not to the penetration of new vortices.

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