Dynamic Phases of Vortices in Superconductors with Periodic Pinning

Abstract

We present results from extensive simulations of driven vortex lattices interacting with periodic arrays of pinning sites. Changing an applied driving force produces a rich variety of novel dynamical plastic flow phases which are very distinct from those observed in systems with random pinning arrays. Signatures of the transition between these different dynamical phases include sudden jumps in the current-voltage curves as well as marked changes in the vortex trajectories and the vortex lattice order. Several dynamical phase diagrams are obtained as a function of commensurability, pinning strength, and spatial order of the pinning sites.

4 pages, 3 figures. To appear in Physical Review Letters. Movies available at http://www-personal.engin.umich.edu/~nori

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