Voltage noise and surface current fluctuations in the superconducting surface sheath

Abstract

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.

accepted for publication in Phys. Rev. B

References in corpus (3)

• Instabilities and disorder-driven first-order transition of the vortex lattice
• Depinning transition in type-II superconductors
• Longitudinal and transverse noise in a moving Vortex Lattice

Cited by in corpus (7)

• Glass-like low frequency ac response of ZrB${}_{12}$ and Nb single crystals in the surface superconducting state
• Onset of surface superconductivity beyond the Saint-James-de Gennes limit
• Change of surface critical current in the surface superconductivity and mixed states of superconducting Niobium
• A study of flux lines lattice order and critical current with time of flight small angle neutron scattering
• Experimental study of the correlation length of critical-current fluctuations in the presence of surface disorder: Probing vortex long-range interactions
• Narrow-band noise due to the moving vortex lattice in superconducting niobium
• Surface superconducting states in yttrium hexaboride single crystal in a tilted magnetic field