Voltage noise and surface current fluctuations in the superconducting surface sheath

Details Voltage noise and surface current fluctuations in the superconducting surface sheath Voltage noise and surface current fluctuations in the superconducting surface sheath

2005-05-31

arxiv.org/abs/cond-mat/0505756v1

Physics

Condensed Matter

Superconductivity

accepted for publication in Phys. Rev. B

Scientific paper

10.1103/PhysRevB.72.012507

We report the first measurements of the voltage noise in the surface superconductivity state of a type-II superconductor. We present strong evidences that surface vortices generates surface current fluctuations whose magnitude can be modified by the pinning ability of the surface. Simple two-stage mechanism governed by current conservation appears to describe the data. We conclude that large voltage fluctuations induced by surface vortices exist while the bulk is metallic. Furthermore, this experiment shows that sole surface current fluctuations can account for the noise observed even in the presence of vortices in the bulk.

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