Possible Superconducting Symmetry and Magnetic Correlations in K0.8Fe2Se2: A 77Se-NMR Study
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概要
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We report 77Se-NMR measurements in the recent discovered K0.8Fe2Se2 with the superconducting transition temperature T_{\text{c}} = 32 K. The characteristic point of this system is that the high density of state is located in the vicinity of the Fermi level. The comparison between Knight shift and nuclear spin lattice relaxation rate 1/T_{1} shows that the antiferromagnetic spin correlation is not strong in this system, but it is reasonable to consider that its development toward low temperatures occurs. 1/T_{1} in the superconducting state can be reproduced well by an s^{\pm}-wave model, but a d-wave model also roughly reproduces the data. Non exponential behavior in 1/T_{1} at low temperatures disagrees with a single isotropic gap.
- 2011-04-15
著者
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KOTEGAWA Hisashi
Department of Materials Engineering Science, Graduate School of Engineering Science, Osaka Universit
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Tou Hideki
Department Of Material Physics Faculty Of Engineering Science Osaka University
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Takano Yoshihiko
National Inst. For Materials Sci. Ibaraki Jpn
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Takeya Hiroyuki
National Institute For Material Science
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MIZUGUCHI Yoshikazu
National Institute for Materials Science
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Hara Yudai
Department Of Physics Kobe University
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Nohara Hiroki
Department of Physics, Kobe University, Kobe 657-8501, Japan
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Nohara Hiroki
Department of Physics, Kobe University, Kobe 658-8530, Japan
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Takano Yoshihiko
National Institute for Materials Science, Tsukuba, Ibaraki 305-0047, Japan
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Takeya Hiroyuki
National Institute for Materials Science, Tsukuba, Ibaraki 305-0047, Japan
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Hara Yudai
Department of Physics, Kobe University, Kobe 658-8530, Japan
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