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Distribution of transport current in a type-II superconductor studied by small-angle neutron scattering
A Pautrat1, C Goupil, Ch Simon
1Laboratoire CRISMAT, UMR 6508 du CNRS et de l'ISMRA, 14050 CAEN, France.
Physical Review Letters
|March 14, 2003
Abstract:
We report small-angle neutron scattering 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.