Abstract
We present two-dimensional computer simulation results of magnetic vortex systems driven by Lorentz force through polycrystalline superconductors with random network structures of twin boundaries. Langevin dynamics simulations of a point vortex model demonstrate that (1) the threshold behavior of I– V curves is observed, (2) the threshold current is a decreasing function of an average superconducting grain size, and (3) the 1/ f noise power spectrum of the ensemble-averaged vortex velocity appears near the threshold current.
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