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Thermal conductivity and gap structure of the superconducting phases of UPt3

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Abstract

We present new measurements of the thermal conductivity (κ) of UPt3 down to very low temperatures (16 mK) and under magnetic fields (up to 4 T) which cover all the superconducting phases of UPt3. The measurements in zero field are compared with recent theoretical predictions for the thermal conductivity, which is dominated by impurity states at the lowest temperatures studied. The measurements under magnetic field at low temperatures are surprising since they don’t show the expected low field square root dependence,\(\kappa \propto \sqrt {\rm B} \). The discontinuity ofdκ/dT atT c changes drastically when passing from the high field low temperatureC phase to the low field high temperatureA phase: this is related to the change of the symmetry of the superconducting order parameter when crossing theA→C phase transition.

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Authors and Affiliations

  1. Département de Recherche Fondamentale sur la Matière Condensée, SPSMS, CEA/Grenoble, 17 rue des Martyrs, 38054, Grenoble cedex 9, France

    H. Suderow, A. Huxley & J. Flouquet

  2. Centre de Recherches sur les Très Basses Températures, CNRS, BP 166, 38042, Grenoble-Cedex 9, France

    J. P. Brison

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  1. H. Suderow
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  2. J. P. Brison
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  3. A. Huxley
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  4. J. Flouquet
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Suderow, H., Brison, J.P., Huxley, A. et al. Thermal conductivity and gap structure of the superconducting phases of UPt3 . J Low Temp Phys 108, 11–30 (1997). https://doi.org/10.1007/BF02396814

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