Thermal conductivity of superconducting UPt3 |
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Authors: | K Behnia L Taillefer J Flouquet D Jaccard K Maki Z Fisk |
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Affiliation: | (1) Centre de Recherches sur les Très Basses Températures, CNRS, Grenoble, France;(2) Present address: Département de Physique de la Matière Condensée, Université de Genève, 24 Quai Ernest-Ansermet, CH-1211 Genève 4, Switzerland;(3) Present address: Laboratoire Louis-Néel (CNRS), BP 166X, 38042 Grenoble Cedex, France;(4) Department of Physics, University of Southern California, Los Angeles, California;(5) Los Alamos National Laboratories, Los Alamos, New Mexico |
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Abstract: | The thermal conductivity of the heavy-fermion superconductor UPt3 has been measured on two single crystals of different quality as a function of temperature and applied magnetic field for different orientations of the heat current relative to both the field and the crystalline axes. The temperature dependence of is far from exponential and nearly the same for both crystals, in which the heat current is, respectively, parallel and perpendicular to the hexagonalc axis, suggesting a gap structure with nodes in the basal plane and normal to it. The field dependence of is strongly anisotropic. In the best sample at low fields, where the scattering of heat carriers by vortices is thought to be important, (H) depends on the relative orientation of field and current. On the other hand, at high fields nearH
c2 (in both samples), (H) depends on the relative orientation of field and crystalline axes, reflecting an anisotropy in the gap structure and in the Fermi velocities. |
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