Finite quasiparticle lifetime in disordered superconductors.
We investigate the complex conductivity of a highly disordered MoC superconducting film with k(F)l approximate to 1, where k(F) is the Fermi wave number 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 iota is appreciably reduced by scattering effects. Characteristics of the scattering centers are independently found by scanning tunneling spectroscopy and agree with those determined from the complex conductivity.
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- European Commission - Community Research and Development Information Service (CORDIS) - Seventh Framework Programme (FP7); USDOE Office of Science - Office of Basic Energy Sciences - Materials Sciences and Engineering Division; Slovak Research and Development Agency (SRDA)
- DOE Contract Number:
- AC02-06CH11357
- OSTI ID:
- 1244713
- Journal Information:
- Physical Review, B: Condensed Matter, Vol. 92, Issue 22; ISSN 0163-1829
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
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