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

T. J. Hagenaars; E. H. Brandt; R. E. Hetzel; W. Hanke; M. Leghissa; G. Saemann-Ischenko

doi:10.1103/PhysRevB.55.11706

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

T. J. Hagenaars, E. H. Brandt, R. E. Hetzel, W. Hanke, M. Leghissa, G. Saemann-Ischenko

DOI 10.1103/PhysRevB.55.11706 · Physical Review B

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Abstract

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.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
YBa2Cu3O Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown