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Effective phonon spectrum and lattice specific heat of superconducting amorphous thallium films

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Zeitschrift für Physik B Condensed Matter

Abstract

Tunneling experiments and measurements of the lattice specific heat have been performed on amorphous and crystalline Tl(+Te) films. The Eliashberg function α2 F(ω) of the amorphous state shows characteristic contributions at low energies. The lattice specific heat at 1 K is increased by a factor of three due to the structural disorder. A comparison of both measurements confirms that phonon softening as well as an increase of the electron-phonon interaction for low-energy phonons contribute to the strong coupling in the amorphous state. The different contributions are discussed.

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Author notes

  1. H. Wühl

    Present address: Institut für Experimentelle Kernphysik, Universität Karlsruhe, 7500, Karlsruhe

  2. A. Comberg

    Present address: Philips-GmbH Forschungslaboratorium Aachen, Weißhausstraße, 5100, Aachen

Authors and Affiliations

  1. Institut für Festkörperforschung, Kernforschungsanlage Jülich, Postfach 1913, D-5170, Jülich 1, Germany

    H. Wühl

  2. Physikalisches Institut, Rheinisch-Westfälische Technische Hochschule Aachen, Templergraben, D-5100, Aachen, Germany

    A. Comberg & S. Ewert

Authors
  1. H. Wühl
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  2. A. Comberg
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  3. S. Ewert
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Dedicated to Prof. Dr. W. Buckel on the occasion of his 60th birthday

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Wühl, H., Comberg, A. & Ewert, S. Effective phonon spectrum and lattice specific heat of superconducting amorphous thallium films. Z. Physik B - Condensed Matter 38, 83–87 (1980). https://doi.org/10.1007/BF01321206

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  • DOI: https://doi.org/10.1007/BF01321206

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