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Thickness effects on the pinning by columnar defects

Authors
Journal
Physica C Superconductivity
0921-4534
Publisher
Elsevier
Publication Date
Identifiers
DOI: 10.1016/s0921-4534(00)01118-7
Keywords
  • Vortices

Abstract

Abstract We compare the angular dependence of the pinning of equivalent columnar defects in GdBa 2Cu 3O 7 thin films and a thicker YBa 2Cu 3O 7 single crystal. The tracks' related enhancement of the critical currents is much smaller for the case of the thin films. We interpret this thickness dependence as resulting from a competition between the pinning of the correlated structures, related to total sample thickness, and surface boundary conditions, which force the vortices to depin from the columnar defects near the sample surface.

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