Distribution of Transport Current in a Type II Superconductor Studied by Small Angle Neutron Scattering

Abstract

We report Small-Angle Neutron Scattering (SANS) measurements on the vortex lattice in a PbIn polycrystal in the presence of an applied current. Using the rocking curves as a probe of the distribution of current in the sample, we observe that vortex pinning is due to the surface roughness. This leads to a surface current that persists in the flux flow region. We show the influence of surface treatments on the distribution of this current.

arXiv comment5 pages 5 figures. accepted for publication in Phys Rev Lett

References in corpus (2)

• Moving glass theory of driven lattices with disorder
• Depinning transition in type-II superconductors

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