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High frequency local modes, superconductivity and anomalous isotope effect in PdH(D) systems

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Zeitschrift für Physik A Hadrons and nuclei

Abstract

The possible mechanisms of enhanced superconductivity in PdH(D) systems are discussed. It is concluded that quenching of paramagnons due to reduced coulomb pseudopotentialalone cannot account for the highT c observed in these systems. Possible participation of the high frequency optic phonon band in BCS-type interaction could lead to a highT c and an opposite isotope effect in these systems. The possibility of the occurrence of some high-q soft modes due to large lattice expansion in these systems to yieldT c ∼9 K requires about 2-fold softing of the effective Pd-Pd force constant in PdH compared to that in metallic Pd.

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Author notes

  1. B. N. Ganguly

    Present address: Photoconductor System Area, Xerox Corporation-W114, 14644, Rochester, N. Y., USA

Authors and Affiliations

  1. Department of Physics and Materials Research Laboratory, University of Illinois, Urbana, Illinois

    B. N. Ganguly

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  1. B. N. Ganguly
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Additional information

This research was supported in part by the National Science Foundation under Grant GH-33634.

I am indebted to Professor John Bardeen and Mr. James Bray for numerous discussions. I am thankful to Drs. W. Buckel, B. Eichler and A. Stritzker for sending a preprint of their work before publication.

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Ganguly, B.N. High frequency local modes, superconductivity and anomalous isotope effect in PdH(D) systems. Z. Physik 265, 433–439 (1973). https://doi.org/10.1007/BF01391800

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  • DOI: https://doi.org/10.1007/BF01391800

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