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arXiv · 0903.2450

Unified Phase Diagram for the Three-Dimensional XY Model of a Point Disordered Type-II Superconductor

Peter Olsson·S. Teitel
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Abstract

We carry out extensive Monte Carlo simulations of the three-dimensional (3D) uniformly frustrated XY model with uncorrelated randomly perturbed couplings, as a model for the equilibrium behavior of an extreme type-II superconductor with quenched uncorrelated random point vortex pinning, in the presence of a uniform applied magnetic field. We map out the resulting phase diagram as a function of temperature T and pinning strength p for a fixed value of the vortex line density. At low p we find a sharp first order vortex lattice melting phase boundary separating a vortex lattice from a vortex liquid. As p increases, it appears that this first order transition smears out over a finite temperature interval, due to the effects of the random pinning, in agreement with several recent experiments. At large p we find a second order transition from vortex liquid to vortex glass.

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Peter Olsson, S. Teitel. 2009-03-13. Unified Phase Diagram for the Three-Dimensional XY Model of a Point Disordered Type-II Superconductor. https://doi.org/10.1103/physrevb.79.214503

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