Pinning and Depinning of the Bragg Glass in a Point Disordered Model Superconductor

Details Pinning and Depinning of the Bragg Glass in a Point Disordered Model Superconductor Pinning and Depinning of the Bragg Glass in a Point Disordered Model Superconductor

2006-04-23

arxiv.org/abs/cond-mat/0604529v1

Physics

Condensed Matter

Superconductivity

Scientific paper

The three-dimensional frustrated anisotropic XY model with point disorder is studied with both Monte Carlo simulations and resistively-shunted-junction dynamics to model the dynamics of a type-II superconductor with quenched point pinning in a magnetic field and a weak applied current. Both the collective pinning and the depinning of the Bragg glass is examined. We find a critical current I_c that separates a creep region with unmeasurable low voltage from a region with a voltage V \sim I-I_c, and also identify the mechanism behind this behavior. It is further found to be possible to collapse the data obtained at a fixed disorder strength by plotting the voltage versus TI, where T is the temperature, though the reason for this behavior is unclear.

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