Journal
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
Volume 80, Issue 1, Pages -Publisher
PHYSICAL SOC JAPAN
DOI: 10.1143/JPSJ.80.013704
Keywords
microwave surface impedance; penetration depth; superconducting gap structure; iron-based superconductors; LiFeAs
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We report results of microwave surface impedance measurements of LiFeAs single crystals. The in-plane penetration depth depends on temperature exponentially at low temperatures, which strongly suggests that this material has the nodeless superconducting gap. The temperature dependence of the superfluid density indicates that LiFeAs is a multigap superconductor with at least two isotropic gaps. In addtion, the real part of the microwave conductivity exhibits a large enhancement below T-c, indicating that the quasi-particle relaxation time, tau, increases rapidly below T-c. We believe that this enhancement is rather common to all superconductors where an inelastic scattering is dominant above T-c, irrespective of the strength of the electron correlation.
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