Groupe de Physique Statistique

Equipe 106, Institut Jean Lamour

                     
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Articles dans des revues à comité de lecture

Transport and vortex pinning in micron-size superconducting Nb films
Ghenim L., Fortin J.-Y., Wen G., Zhang X., Baraduc C., Villegier J.-C.
Physical Review B - Condensed Matter and Materials Physics 69 (2004) 064513
HAL : hal-00002859

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.



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