Conference publications

Abstracts

XXIII conference

Numerical modeling of superconducting vortex dynamics on Nb microtubes

Rezaev R.O., Levchenko E.A., Schmidt O.G., Fomin V.M.

National Research Tomsk Polytechnic University, Lenin av., 30, Tomsk, 634050, Russia National Research Nuclear University MePhI, Kashirskoye sh., 31, Moscow, 115409, Russia Institute for Integrative Nanosciences, IFW Dresden, Helmholtzstraße 20, D-01069 Dresden, Germany Material Systems for Nanoelectronics, Chemnitz University of Technology, ReichenhainerStraße 70, D-09126 Chemnitz, Germany

Based on the time-dependent Ginzburg-Landau equation [1] for the superconductor order parameter, extensive numerical study of the superconducting phase in magnetic field on an open Nb microtube is performed. In particular, in low magnetic fields, vortices nucleate periodically at one edge of the tube, subsequently move along the tube under the action of the Lorentz force and denucleate at the opposite edge of the tube. In high magnetic fields, vortices pass along rows close to the slit [2]. The curvature is shown to change the critical magnetic field (at which vortices start to nucleate at the edges) more than six times as compared to the planar structures. In higher magnetic field the bifurcation in vortices trajectories occurs [3].

The vortex dynamics in the open tubeare described by two characteristic times: the period of nucleation of vortices at one edge of the tube and the duration of motion of a vortex along the tube.Simulation reveals that both characteristic times change by a factor of up to two due to the presence of pinning centers. Different regimes of vortex dynamics are effectively controlled by varying positions of pinning centers at given values of the applied magnetic field, the tube radius and the transport current orthogonal to the tube axis [4].

References

1. M. Tinkham, Introduction to Superconductivity, McGraw-Hill: New York, 1996

2. V. M. Fomin, R. O. Rezaev and O. G. Schmidt, Nano Lett., 2012, 12, 1282-1287

3. R.O. Rezaev, E.A. Levchenko, O.G. Schmid, V.M. Fomin, Rus. Phys J., 2015, 58(5), 35-40

4. R. O. Rezaev, V. M. Fomin and O. G. Schmidt, Physica C, 2014, 497, 1 -5

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