Vortices in a cylinder: Localization after depinning

Details Vortices in a cylinder: Localization after depinning Vortices in a cylinder: Localization after depinning

1998-04-08

arxiv.org/abs/cond-mat/9804093v1

Phys.Rev.Lett. 82 (1999) 3140-3143

Physics

Condensed Matter

Statistical Mechanics

4 pages, REVTEX, 2 eps figures

Scientific paper

10.1103/PhysRevLett.82.3140

Edge effects in the depinned phase of flux lines in hollow superconducting cylinder with columnar defects and electric current along the cylinder are investigated. Far from the ends of the cylinder vortices are distributed almost uniformly (delocalized). Nevertheless, near the edges these free vortices come closer together and form well resolved dense bunches. A semiclassical picture of this localization after depinning is described. For a large number of vortices their density $\rho(x)$ has square root singularity at the border of the bunch ($\rho(x)$ is semicircle in the simplest case). However, by tuning the strength of current, the various singular regimes for $\rho(x)$ may be reached. Remarkably, this singular behaviour reproduces the phase transitions discussed during the past decade within the random matrix regularization of 2d-Gravity.

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