Physics – Condensed Matter – Superconductivity
Scientific paper
2009-03-13
Phys. Rev. B 79, 214503 (2009)
Physics
Condensed Matter
Superconductivity
16 pages, 15 figures
Scientific paper
10.1103/PhysRevB.79.214503
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.
Olsson Peter
Teitel S.
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