Acoustic matching of superconducting films to substrates
- Cite this article as:
- Kaplan, S.B. J Low Temp Phys (1979) 37: 343. doi:10.1007/BF00119193
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.