Physics – Condensed Matter – Superconductivity
Scientific paper
2010-09-23
J. Phys. Soc. Jpn., 80 (2011) 013704
Physics
Condensed Matter
Superconductivity
13 pages, 3 figures
Scientific paper
10.1143/JPSJ.80.013704
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 multi-gap superconductor with at least two isotropic gaps. In addtion, the real part of the microwave conductivity exhibits a large enhancement below $T_\mathrm{c}$, indicating that the quasi-particle relaxation time, $\tau$, increases rapidly below $T_\mathrm{c}$. We believe that this enhancement is rather common to all superconductors where an inelastic scattering is dominant above $T_\mathrm{c}$, irrespective of the strength of the electron correlation.
Imai Yoshinori
Kitagawa Kentaro
Machida Masahiko
Maeda Atsutaka
Matsubayashi Kazuyuki
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