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arXiv · 0911.4066

Nonequilibrium steady states of driven magnetic flux lines in disordered type-II superconductors

T. Klongcheongsan·T. J. Bullard·U. C. Tauber
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Abstract

We investigate driven magnetic flux lines in layered type-II superconductors subject to various configurations of strong point or columnar pinning centers by means of a three-dimensional elastic line model and Metropolis Monte Carlo simulations. We characterize the resulting nonequilibrium steady states by means of the force-velocity / current-voltage curve, static structure factor, mean vortex radius of gyration, number of double-kink and half-loop excitations, and velocity / voltage noise spectrum. We compare the results for the above observables for randomly distributed point and columnar defects, and demonstrate that the three-dimensional flux line structures and their fluctuations lead to a remarkable variety of complex phenomena in the steady-state transport properties of bulk superconductors.

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T. Klongcheongsan, T. J. Bullard, U. C. Tauber. 2009-11-20. Nonequilibrium steady states of driven magnetic flux lines in disordered type-II superconductors. https://doi.org/10.1088/0953-2048%2F23%2F2%2F025023

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