TY - JOUR
T1 - Microwave surface impedance measurements of LiFeAs single crystals
AU - Imai, Yoshinori
AU - Takahashi, Hideyuki
AU - Kitagawa, Kentaro
AU - Matsubayashi, Kazuyuki
AU - Nakai, Noriyuki
AU - Nagai, Yuki
AU - Uwatoko, Yoshiya
AU - Machida, Masahiko
AU - Maeda, Atsutaka
PY - 2011/1
Y1 - 2011/1
N2 - 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 Tc, indicating that the quasi-particle relaxation time, τ, increases rapidly below T c. We believe that this enhancement is rather common to all superconductors where an inelastic scattering is dominant above Tc, irrespective of the strength of the electron correlation.
AB - 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 Tc, indicating that the quasi-particle relaxation time, τ, increases rapidly below T c. We believe that this enhancement is rather common to all superconductors where an inelastic scattering is dominant above Tc, irrespective of the strength of the electron correlation.
KW - Iron-based superconductors
KW - LiFeAs
KW - Microwave surface impedance
KW - Penetration depth
KW - Superconducting gap structure
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U2 - 10.1143/JPSJ.80.013704
DO - 10.1143/JPSJ.80.013704
M3 - Article
AN - SCOPUS:78651289944
SN - 0031-9015
VL - 80
JO - Journal of the Physical Society of Japan
JF - Journal of the Physical Society of Japan
IS - 1
M1 - 013704
ER -