Microwave Surface Impedance Measurements of LiFeAs Single Crystals
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概要
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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 multi-gap superconductor with at least two isotropic gaps. In addtion, the real part of the microwave conductivity exhibits a large enhancement below T_{\text{c}}, indicating that the quasi-particle relaxation time, \tau, increases rapidly below T_{\text{c}}. We believe that this enhancement is rather common to all superconductors where an inelastic scattering is dominant above T_{\text{c}}, irrespective of the strength of the electron correlation.
- 2011-01-15
著者
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Matsubayashi Kazuyuki
Institute For Solid State Physics The University Of Tokyo
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Kitagawa Kentaro
Institute For Solid State Physics University Of Tokyo
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Uwatoko Yoshiya
Institute For Solid State Physics (issp) The University Of Tokyo
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Imai Yoshinori
Department Of Basic Science The University Of Tokyo
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Maeda Atsutaka
Department Of Applied Physics The University Of Tokyo
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MACHIDA Masahiko
CCSE, Japan Atomic Energy Agency
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Takahashi Hideyuki
Department Of Bacteriology National Institute Of Infectious Diseases
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Uwatoko Yoshiya
Institute for Solid State Physics, University of Tokyo, Kashiwa, Chiba 277-8581, Japan
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Nakai Noriyuki
CCSE, Japan Atomic Energy Agency, Taito, Tokyo 110-0015, Japan
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Nagai Yuki
CCSE, Japan Atomic Energy Agency, Taito, Tokyo 110-0015, Japan
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Matsubayashi Kazuyuki
Institute for Solid State Physics, University of Tokyo, Kashiwa, Chiba 277-8581, Japan
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Kitagawa Kentaro
Institute for Solid State Physics, University of Tokyo, Kashiwa, Chiba 277-8581, Japan
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Nagai Yuki
CCSE, Japan Atomic Energy Agency, Kashiwa, Chiba 277-8587, Japan
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MACHIDA Masahiko
CCSE, JAERI
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Maeda Atsutaka
Department of Basic Science, The University of Tokyo, Meguro, Tokyo 153-8902, Japan
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Uwatoko Yoshiya
Institute for Solid State Physics
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