Finite quasiparticle lifetime in disordered superconductors
M Žemlička, P Neilinger, M Trgala, M Rehák, D Manca… - Physical Review B, 2015 - APS
Physical Review B, 2015•APS
We investigate the complex conductivity of a highly disordered MoC superconducting film
with k F l≈ 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, τ, offers a perfect
description of the experimentally observed complex conductivity. We show that τ is …
with k F l≈ 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, τ, offers a perfect
description of the experimentally observed complex conductivity. We show that τ is …
We investigate the complex conductivity of a highly disordered MoC superconducting film with , where is the Fermi wave number and is the mean free path, derived from experimental transmission characteristics of coplanar waveguide resonators in a wide temperature range below the superconducting transition temperature . We find that the original Mattis-Bardeen model with a finite quasiparticle lifetime, , offers a perfect description of the experimentally observed complex conductivity. We show that 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.
American Physical Society