Abrikosov vortex escape from a columnar defect as a topological electronic transition in vortex core

Details Abrikosov vortex escape from a columnar defect as a topological electronic transition in vortex core Abrikosov vortex escape from a columnar defect as a topological electronic transition in vortex core

2011-06-10

arxiv.org/abs/1106.1971v2

Pis'ma v ZhETP, vol.94, iss.10, pp.823-827 (2011)

Physics

Condensed Matter

Superconductivity

5 pages, 4 figures

Scientific paper

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 $j_L$ 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 $j_d > j_L$ is caused by merging of different Fermi surface segments, which accompanies the formation of a freely moving vortex.

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