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Unified Phase Diagram for the Three-Dimensional XY Model of a Point    Disordered Type-II Superconductor
Umeå University, Faculty of Science and Technology, Physics.
University of Rochester, Rochester, NY.
2009 (English)In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 79, no 21, 214503- p.Article in journal (Refereed) Published
Abstract [en]

We carry out extensive Monte Carlo simulations of the three-dimensional 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.

Place, publisher, year, edition, pages
2009. Vol. 79, no 21, 214503- p.
National Category
Condensed Matter Physics
Research subject
Physics
Identifiers
URN: urn:nbn:se:umu:diva-27027DOI: 10.1103/PhysRevB.79.214503OAI: oai:DiVA.org:umu-27027DiVA: diva2:275656
Available from: 2009-11-06 Created: 2009-11-06 Last updated: 2017-12-12

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