1.
Phys Rev Lett
; 90(8): 087002, 2003 Feb 28.
Article
in English
| MEDLINE
| ID: mdl-12633451
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.