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Thermal Conductivity of Superconducting UPt$_3$ at Low Temperatures | M.J. Graf
; S.-K. Yip
; J.A. Sauls
; | Date: |
7 Dec 1995 | Journal: | J. Low Temp. Phys. 102 (1996) 367 | Subject: | cond-mat supr-con | Affiliation: | Northwestern University | Abstract: | We study the thermal conductivity within the E$_{1g}$ and E$_{2u}$ models for superconductivity in UPt$_3$ and compare the theoretical results for electronic heat transport with recently measured results reported by Lussier, Ellman and Taillefer. The existing data down to $T/T_capprox 0.1$ provides convincing evidence for the presence of both line and point nodes in the gap, but the data can be accounted for either by an E$_{1g}$ or E$_{2u}$ order parameter. We discuss the features of the pairing symmetry, Fermi surface, and excitation spectrum that are reflected in the thermal conductivity at very low temperatures. Significant differences between the E$_{1g}$ and E$_{2u}$ models are predicted to develop at excitation energies below the bandwidth of the impurity-induced Andreev bound states. The zero-temperature limit of the $f hat c$ axis thermal conductivity, $lim_{T o 0} kappa_c/T$, is underline{universal} for the E$_{2u}$ model, but non-universal for the E$_{1g}$ model. Thus, impurity concentration studies at very low temperatures should differentiate between the nodal structures of the E$_{2u}$ and E$_{1g}$ models. | Source: | arXiv, cond-mat/9512054 | Services: | Forum | Review | PDF | Favorites |
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