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Critical exponent ηϕof the Lattice London Superconductor and vortex loops in the 3D XY model

Peter Olsson

cond-mat.stat-mecharXiv:cond-mat/0103345

Abstract

The anomalous dimension of the lattice London superconductor is determined from finite size scaling of the susceptibility to be ηϕ= -0.79(1). Indirect determinations of ηϕfrom properties of the vortex loops in the 3D XY model are also attempted, but it is found that the results are sensitive to details in the simulations related to vortex loop intersections. It is suggested that the same value of ηϕcan at most be obtained from vortex loop properties in the limit of low vortex density.

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