Weak localization of disordered quasiparticles in the mixed superconducting state

Details Weak localization of disordered quasiparticles in the mixed superconducting state Weak localization of disordered quasiparticles in the mixed superconducting state

1998-08-26

arxiv.org/abs/cond-mat/9808297v3

Phys. Rev. B 59 (1999) 4382

Physics

Condensed Matter

Superconductivity

RevTex, 8 pages, 1 eps figure, typos corrected

Scientific paper

10.1103/PhysRevB.59.4382

Starting from a random matrix model, we construct the low-energy effective field theory for the noninteracting gas of quasiparticles of a disordered superconductor in the mixed state. The theory is a nonlinear sigma model, with the order parameter field being a supermatrix whose form is determined solely on symmetry grounds. The weak localization correction to the field-axis thermal conductivity is computed for a dilute array of s-wave vortices near the lower critical field H_c1. We propose that weak localization effects, cut off at low temperatures by the Zeeman splitting, are responsible for the field dependence of the thermal conductivity seen in recent high-T_c experiments by Aubin et al.

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