Finite quasiparticle lifetime in disordered superconductors

Abstract

We investigate the complex conductivity of a highly disordered MoC superconducting film with $k_{F}l\approx 1$, where $k_F$ is the Fermi wavenumber and $l$ is the mean free path, derived from experimental transmission characteristics of coplanar waveguide resonators in a wide temperature range below the superconducting transition temperature $T_c$. We find that the original Mattis-Bardeen model with a finite quasiparticle lifetime, $\tau$, offers a perfect description of the experimentally observed complex conductivity. We show that $\tau$ is appreciably reduced by scattering effects. Characteristics of the scattering centers are independently found by the scanning tunneling spectroscopy and agree with those determined from the complex conductivity.

8 pages, 10 figures

References in corpus (8)

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• Reducing intrinsic loss in superconducting resonators by surface treatment and deep etching of silicon substrates
• The Higgs Mode in Disordered Superconductors Close to a Quantum Phase Transition
• Strongly disordered TiN and NbTiN s-wave superconductors probed by microwave electrodynamics
• Evidence for two-gap superconductivity in (Ba,K)Fe_2As_2 by directional point contact Andreev reflection spectroscopy
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