Abstract
Recent thermal conductivity measurements on UPt 3 single crystals by Lussier et al. indicate the existence of a strong b–c anisotropy in the superconducting state. We calculate the thermal conductivity in various unconventional candidate states appropriate for the UPt 3 “B phase” and compare with experiment, specifically the E 2 u and E 1 g (1, i) states predicted in some Ginzburg-Landau analyses of the phase diagram. For the simplest realizations of these states over spherical or ellipsoidal Fermi surfaces, the normalized E 2 u conductivity is found, surprisingly, to be completely isotropic. We discuss the effects of inelastic scattering and realistic Fermi surface anisotropy, and deduce constraints on the symmetry class of the UP t 3 ground state.
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