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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

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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