Distribution of Transport Current in a Type II Superconductor Studied by Small Angle Neutron Scattering
arXiv:cond-mat/0301292 · doi:10.1103/PhysRevLett.90.087002
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.
5 pages 5 figures. accepted for publication in Phys Rev Lett