, Volume 37, Issue 3-4, pp 343-365

Acoustic matching of superconducting films to substrates

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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.

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