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American Physical Society, Physical review B, 6(69), 2004

DOI: 10.1103/physrevb.69.064513

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Transport and vortex pinning in micron-size superconducting Nb films

Journal article published in 2004 by Lamya Ghenim, Jean-Yves Fortin ORCID, Gehui Wen, Xixiang Zhang, Claire Baraduc, Jean-Claude Villegier
This paper is available in a repository.
This paper is available in a repository.

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Abstract

We have carried out Hall measurements on thin films of Nb in the flux-flow regime. The Hall bars were several microns in scale. Oscillations with magnetic field in the transverse and longitudinal resistances between the depinning field Bd and the upper critical field Bc2 are observed below Tc. The Hall effect may even change sign. The transverse and longitudinal resistances are interpreted in terms of current-driven motion of vortices in the presence of a few impurities. Simulations from time-dependent Ginzburg-Landau equations confirm this argument.