Vortex Plastic Motion in Twinned Superconductors
J. Groth, C. Reichhardt, C. J. Olson, Stuart Field, Franco Nori
Abstract
We present simulations, without electrodynamical assumptions, of B(x,y,H(t)), M(H(t)), and Jc(H(t)), in hard superconductors, for a variety of twin-boundary pinning potential parameters, and for a range of values of the density and strength of the pinning sites. We numerically solve the overdamped equations of motion of up to 104 flux-gradient-driven vortices which can be temporarily trapped at 106 pinning centers. These simulations relate macroscopic measurements (e.g., M(H), ``flame'' shaped B(x,y) profiles) with the underlying microscopic pinning landscape and the plastic dynamics of individual vortices.
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