Acoustic coupling and effective quasiparticle lifetimes of superconducting films

Abstract

Our results on the acoustical coupling of thin superconducting films are recalculated using the phonon-enhanced electronic density of states. The acoustic coupling of lead to tin is smaller than previously reported. Recent revised measurements of the quasiparticle lifetimes in lead indicate that it is not necessary to assume additional inelastic processes in lead as previously reported. We find that the acoustic coupling of lead to tin is smaller than the acoustic coupling of lead to helium.