Dynamic transition in vortex flow in strongly disordered Josephson junction arrays and superconducting thin films
Abstract
We study the dynamics of vortices in strongly disordered d=2 Josephson junction arrays and superconducting films driven by a current. We find a dynamic phase transition in vortex flow at a current Ip>Ic. Below Ip there is plastic flow characterized by an average-velocity correlation length scale v in the direction of motion, which diverges when approaching Ip. Above Ip we find a moving vortex phase with homogeneous flow and short range smectic order. A finite size analysis shows that this phase becomes asymptotically a liquid for large length scales.
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