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The electronic thermal conductivity of superconductors with paramagnetic impurities

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Zeitschrift für Physik B Condensed Matter

Abstract

We have measured the thermal conductivitiesK s in the superconducting state andK n in the normal state of (La1−x REx) Al2 single crystals (RE: Gd, Ce;x≦0.005) between 0.4 and 8 K. The lattice conductivity is small in the superconducting state above 0.5T c and in the normal state and is independent of annealing. Annealing does, however, strongly depress the ratioK e s /K e n of the electronic thermal conductivities. We also report on a theory of the electronic thermal conductivity which describes the experimental results quantitatively. Interaction effects between impurities show up for the samples with the highest RE-concentration.

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Authors and Affiliations

  1. II. Physikalisches Institut, Universität zu Köln, Universitätsstraße 14, D-5000, Köln 41, Federal Republic of Germany

    J. H. Moeser & F. Steglich

  2. Institut für Theoretische Physik, Universität Köln, Universitätsstraße 14, D-5000, Köln 41, Federal Republic of Germany

    C. Leser & E. Müller-Hartmann

Authors
  1. J. H. Moeser
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  2. F. Steglich
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  3. C. Leser
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  4. E. Müller-Hartmann
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Work performed within the research program of the Sonderforschungsbereich 125 Aachen/Jülich/Köln

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Moeser, J.H., Steglich, F., Leser, C. et al. The electronic thermal conductivity of superconductors with paramagnetic impurities. Z Physik B 25, 339–349 (1976). https://doi.org/10.1007/BF01315249

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  • DOI: https://doi.org/10.1007/BF01315249

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