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VOLUME 94 | ISSUE 10 | PAGE 823
Abrikosov vortex escape from a columnar defect as a topological electronic transition in vortex core
A. S. Mel'nikov, A. V. Samokhvalov

Institute for Physics of Microstructures RAS, 603950 Nizhny Novgorod, Russia

Abstract
We study microscopic scenario of vortex escape from a columnar defect under the influence of a transport current. For defect radii smaller than the superconducting coherence length the depinning process is shown to be a consequence of two subsequent topological electronic transitions in a trapped vortex core. The first transition at a critical current jL is associated with the opening of Fermi surface segments corresponding to the creation of a vortex-antivortex pair bound to the defect. The second transition at a certain current jd > jL is caused by merging of different Fermi surface segments, which accompanies the formation of a freely moving vortex.


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