Regensburg 2013 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 64: Superconductivity: Heterostructures, Andreev Scattering, Vortex Physics
TT 64.10: Vortrag
Donnerstag, 14. März 2013, 17:30–17:45, H21
Vortex dynamics in superconductor micro- and nanotubes: Interplay between the effects of curvature and pinning centers — •V. M. Fomin1, R. O. Rezaev1,2, and O. G. Schmidt1,3 — 1Institute for Integrative Nanosciences, IFW-Dresden, D-01069 Dresden, Germany — 2National Research Nuclear University “Moscow Engineering Physics Institute”, 115409 Moscow, Russia — 3Material Systems for Nanoelectronics, Chemnitz University of Technology, D-09107 Chemnitz, Germany
Achievements in roll-up technique make it possible to fabricate cylindrical tubes of superconducting materials (e. g., Nb) of radius about 500 nm from a planar film of thickness about 50 nm, where the quasi-2-dimensionality of the film is combined with a curvature. The vortex dynamics in open tubes are significantly determined by the curvature of the superconductor at the nano- or microscale as well as by the impact of single and multiple pinning centers. The presence of the pinning centers allows for an efficient control over the threshold value of the transport current (for emergence of vortex dynamics) and the transition magnetic field (separating sparse- and many-vortex regimes).The detection of the tube curvature effects on vortex dynamics suggested in [1] stays feasible in the presence of pinning centers. This work was partly supported by the IEEE Council on Superconductivity.
[1] V. M. Fomin, R. O. Rezaev, and O. G. Schmidt, Nano Lett. 12, 1282 (2012).