Observation of regions of short-range order in the vortex structure in a type II superconductor
Vinnikov L. Ya. , Grigor'eva I. V.
Decoration with disperse Fe particles in a nonuniformly deformed single crystal of Nb with 5% Mo reveals a block structure in a vortex lattice at a low density of pinning centers in the sample. The lattice is completely disrupted when the density of these centers is high. The observed behavior corresponds to the predictions of the theory of collective pinning.