Dynamic transition in vortex flow in strongly disordered Josephson junction arrays and superconducting thin films

Details Dynamic transition in vortex flow in strongly disordered Josephson junction arrays and superconducting thin films Dynamic transition in vortex flow in strongly disordered Josephson junction arrays and superconducting thin films

1998-09-29

arxiv.org/abs/cond-mat/9809395v1

Physics

Condensed Matter

Superconductivity

4 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.82.181

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 $I_p>I_c$. Below $I_p$ there is plastic flow characterized by an average-velocity correlation length scale $\xi_v$ in the direction of motion, which diverges when approaching $I_p$. Above $I_p$ 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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