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Enhancement ofT c in BCS theory extended by interband two-phonon exchange

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Zeitschrift für Physik B Condensed Matter

Abstract

Band crossing and hybridization effects on superconductivity are investigated within a weak coupling limit of an extended BCS theory. Two-phonon modiated attractive two-band (p−d) interactions induce anisotropic coupled energy gaps, enhancement of the transition temperatureT c , and a material-dependent isotope effect. The individual gap tok B T c ratios deviate from the usual BCS value but their average recovers approximately the usual value. Effects on ultrasonic attenuation and coherence lengths are briefly discussed.

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Authors and Affiliations

  1. Max-Planck-Institut für Festkörperforschung, Heisenbergstrasse 1, W-7000, Stuttgart 80, Federal Republic of Germany

    A. Bussmann-Holder & A. Simon

  2. Theoretical Division, Los Alamos National Laboratory, 87545, Los Alamos, NM, USA

    A. R. Bishop

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  1. A. Bussmann-Holder
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  2. A. R. Bishop
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  3. A. Simon
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Bussmann-Holder, A., Bishop, A.R. & Simon, A. Enhancement ofT c in BCS theory extended by interband two-phonon exchange. Z. Physik B - Condensed Matter 90, 183–186 (1993). https://doi.org/10.1007/BF02198152

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  • DOI: https://doi.org/10.1007/BF02198152

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