Thermal Conductivity Anisotropy in Superconducting $UPt_3$

Details Thermal Conductivity Anisotropy in Superconducting $UPt_3$ Thermal Conductivity Anisotropy in Superconducting $UPt_3$

1994-10-25

arxiv.org/abs/cond-mat/9410087v1

Physics

Condensed Matter

4 postscript pages, UFL1025

Scientific paper

10.1016/0038-1098(95)00050-X

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 $E_{2u}$ and $E_{1g}$ $(1,i)$ 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 $E_{2u}$ 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 $UPt_3$ ground state.

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