Dresden 2014 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 33: Superconductivity: Vortex Physics
TT 33.1: Vortrag
Dienstag, 1. April 2014, 09:45–10:00, HSZ 201
Dynamics of superconductor vortices in finite-thickness Nb open microtubes — •Vladimir M. Fomin1, Renat R. Dusaev2, Roman O. Rezaev2,3, and Oliver G. Schmidt1,4 — 1Institute for Integrative Nanosciences, IFW-Dresden, D-01069 Dresden, Germany — 2Tomsk Polytechnic University, Tomsk, 634050, Russia — 3Moscow Engineering Physics Institute, Moscow, 115409, Russia — 4Material Systems for Nanoelectronics, Chemnitz University of Technology, D-09107 Chemnitz, Germany
Combination of reduced dimensionality with curved geometry in rolled-up superconductor micro- and nanotubes is a rich source of novel vortex dynamics [1,2]. Numerical modeling of a realistic finite-thickness Nb open microtube in a magnetic field orthogonal to the tube axis has been performed within the Ginzburg-Landau approach. An increase of thickness enhances the vortex-vortex interaction which results in a steady configuration with a reduced number of vortices and extends the upper magnetic field, at which the vortex dynamics occur, by a factor of two at least. This leads to new vortex dynamics as compared to the zero-thickness model. In particular, a regime is revealed where a configuration of vortices is fixed in the region far from the tube ends, while in the vicinity of the ends vortices nucleate at the top and bottom sides and then move toward each other until they annihilate as a vortex-antivortex pair.
The work was supported by the BMBF-Russia research grant 01DS13009.
V. M. Fomin, R. O. Rezaev, O. G. Schmidt, Nano Lett. 12, 1282 (2012)
R. O. Rezaev, V. M. Fomin, O. G. Schmidt, Physica C 497, 1 (2014)