Weak Spin Fluctuation with Finite Wave Vector and Superconducting Gap Symmetry in KxFe2-ySe2: 77Se Nuclear Magnetic Resonance
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概要
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We report 77Se-nuclear magnetic resonance (NMR) results down to sufficiently low temperatures under magnetic fields parallel to both the ab-plane and the c-axis in a paramagnetic/superconducting (PM/SC) phase of KxFe2-ySe2. The observation of anisotropy in the orbital part of the Knight shift results in the anisotropy of its spin part increasing on approaching the transition temperature. The anisotropy of the Korringa relation suggests the presence of the weak spin fluctuations with a finite wave vector \mbi{q}, which induce the magnetic fluctuations along the ab-plane at the Se site. Such fluctuations do not correspond to the stripe (\pi,0) correlation of the Fe moment observed in many Fe-based superconductors, and are not contradictory to weak (\pi,\pi) correlations. The nuclear spin--lattice relaxation rate 1/T_{1} shows a field-independent T_{1} T\sim \text{const.} behavior at low temperatures for H\parallel ab, which is attributed to the nonzero density of states at the Fermi level and can be explained by the sign-changing order parameter even for nodeless gaps. The temperature dependence of 1/T_{1} is reproduced well by nodeless models with two isotropic gaps or a single anisotropic gap. The obtained gap magnitude in the isotropic two-gap model is comparable to those obtained in the angle-resolved photoemission spectroscopy experiments.
- 2012-10-15
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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Tomita Yusuke
Department Of Immunogenetics Graduate School Of Medical Sciences Kumamoto University
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Tomita Yusuke
Department of Physics, Kobe University, Kobe 658-8530, Japan
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Mizuguchi Yoshikazu
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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