Deformation and Depinning of Superconducting Vortices from Artificial Defects: A Ginzburg-Landau Study

Details Deformation and Depinning of Superconducting Vortices from Artificial Defects: A Ginzburg-Landau Study Deformation and Depinning of Superconducting Vortices from Artificial Defects: A Ginzburg-Landau Study

2002-09-24

arxiv.org/abs/cond-mat/0209541v1

Physics

Condensed Matter

Superconductivity

10 pages,9 figures

Scientific paper

10.1103/PhysRevB.67.054504

Using Ginzburg-Landau theory, we have performed detailed studies of vortices in the presence of artificial defect arrays, for a thin film geometry. We show that when a vortex approaches the vicinity of a defect, an abrupt transition occurs in which the vortex core develops a ``string'' extending to the defect boundary, while simultaneously the supercurrents and associated magnetic flux spread out and engulf the defect. Current induced depinning of vortices is shown to be dominated by the core string distortion in typical experimental situations. Experimental consequences of this unusual depinning behavior are discussed.

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