Authors: R O Rezaev E A Levchenko O G Schmidt V M Fomin
Publish Date: 2015/09/17
Volume: 58, Issue: 5, Pages: 623-628
Abstract
We consider the special features at nano and microscales of the vortex dynamics on superconducting cylindrical Nb tubes produced by the rollup selfrolling technique A transport current enters the tube through electrodes placed on both sides of a cut in the paraxial direction of the tube The system is in the magnetic field perpendicular to the tube axis The vortex dynamics is described by means of characteristic times time Δt1 needed for a vortex to move from one edge of the tube to another and time Δt2 between two consecutive vortex nucleation events at one edge of the tube A range of magnetic field values is analyzed where Δt1 as a function of the magnetic field has a highly nonlinear and nonmonotonic behavior For certain values of the magnetic field two different trajectories are possible for a moving vortex ie a bifurcation phenomenon occurs We explain the reason of this bifurcation
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