Vortex-line liquid phases: Longitudinal superconductivity in the lattice London model

Details Vortex-line liquid phases: Longitudinal superconductivity in the lattice London model Vortex-line liquid phases: Longitudinal superconductivity in the lattice London model

1997-01-30

arxiv.org/abs/cond-mat/9701218v1

Phys. Rev. B 55 (1997) 11706

Physics

Condensed Matter

Superconductivity

8 pages, Revtex, with eps figures. To appear in Phys. Rev. B

Scientific paper

10.1103/PhysRevB.55.11706

We study the vortex-line lattice and liquid phases of a clean type-II superconductor by means of Monte Carlo simulations of the lattice London model. Motivated by a recent controversy regarding the presence, within this model, of a vortex-liquid regime with longitudinal superconducting coherence over long length scales, we directly compare two different ways to calculate the longitudinal coherence. For an isotropic superconductor, we interpret our results in terms of a temperature regime within the liquid phase in which longitudinal superconducting coherence extends over length scales larger than the system thickness studied. We note that this regime disappears in the moderately anisotropic case due to a proliferation, close to the flux-line lattice melting temperature, of vortex loops between the layers.

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