Evidence for Unconventional Superconductivity in Arsenic-Free Iron-Based Superconductor FeSe : A ^<77>Se-NMR Study(Condensed matter: electronic structure and electrical, magnetic, and optical properties)
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概要
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We report the results of ^<77>Se-nuclear magnetic resonance (NMR) in α-FeSe, which exhibits a similar crystal structure to the LaFeAsO_<1-x>F_x superconductor and shows superconductivity at 8K. The nuclearspin lattice relaxation rate 1/T_1 shows T^3 behavior below the superconducting transition temperature T_c without a coherence peak. The T_1T=const. behavior, indicative of the Fermi liquid state, can be seen in a wide temperature range above T_c. The superconductivity in α-FeSe is also an unconventional one as well as LaFeAsO_<1-x>F_x and related materials. The FeAs layer is not essential for the occurrence of the unconventional superconductivity.
- 社団法人日本物理学会の論文
- 2008-11-15
著者
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TOU Hideki
Department of Quantum Matter, AdSM, Hiroshima University
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KOTEGAWA Hisashi
Department of Materials Engineering Science, Graduate School of Engineering Science, Osaka Universit
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Tou Hideki
Kobe Univ. Kobe Jpn
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Tou Hideki
Department Of Physics Kobe University
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Tou Hideki
Department Of Material Physics Faculty Of Engineering Science Osaka University
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TAKANO Yoshihiko
National Institute for Materials Science
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Takano Yoshihiko
National Inst. For Materials Sci. Ibaraki Jpn
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Takano Y
National Research Institute For Metals
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Takano Yoshihiko
Nanomaterials Laboratory National Institute For Materials Science
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Kotegawa Hisashi
Department Of Physics Kobe University
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MASAKI Satoru
Department of Physics, Faculty of Science, Kobe University
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MIZUGUCHI Yoshikazu
National Institute for Materials Science
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AWAI Yoshiki
Department of Physics, Kobe University
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MIZUGUCHII Yoshikazu
National Institute for Materials Science
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Awai Yoshiki
Department Of Physics Kobe University
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Masaki Satoru
Department Of Physics Kobe University
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Masaki Satoru
Department Of Physics Faculty Of Science Kobe University
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