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Acoustic matching of superconducting films to substrates

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Abstract

Acoustic mismatch theory is used to estimate phonon transmission coefficients for various superconductor/substrate interfaces. It is shown that the conventionally employed substrates offer the largest acoustic mismatch to many of the commonly studied superconductors, thereby leading to unnecessarily large phonon-trapping and other nonequilibrium effects. Most available experimental results are shown to be in reasonable agreement with the theoretical estimates.

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Authors and Affiliations

  1. Electromagnetic Technology Division, National Bureau of Standards, Boulder, Colorado

    Steven B. Kaplan

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  1. Steven B. Kaplan
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Additional information

Work supported by a National Research Council Postdoctoral Fellowship and Office of Naval Research Contract No. N00014-78-F-0040.

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Kaplan, S.B. Acoustic matching of superconducting films to substrates. J Low Temp Phys 37, 343–365 (1979). https://doi.org/10.1007/BF00119193

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  • DOI: https://doi.org/10.1007/BF00119193

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