Magnetic and Structural Studies of the Quasi-Two-Dimensional Spin-Gap System (CuCl)LaNb_2O_7(Condensed matter : electronic structure and electrical, magnetic, and optical properties)
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概要
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We report magnetization, nuclear magnetic resonance (NMR), nuclear quadrupole resonance (NQR), and transmission electron microscopy (TEM) studies on the quasi-two-dimensional spin-gap system (CuCl)LaNb_2O_7, a possible candidate for the J_1-J_2 model on a square lattice. A sharp single NQR line is observed at the Cu and Cl sites, indicating that both Cu and Cl atoms occupy a unique site. However, the electric field gradient tensors at the Cu, Cl, and La sites do not have axial symmetry. This is incompatible with the reported crystal structure. Thus the J_1-J_2 model has to be modified. We propose alternative two-dimensional dimer models based on the NMR, NQR, and TEM results. The value of the hyperfine coupling constant at the Cu sites indicates that the spin density is mainly on the d(3z^2-r^2) orbital (z ‖ c). At 1.5K, Cu- and Nb-NMR signals disappear above the critical field B_<c1>〜10.3T determined from the onset of the magnetization, indicating a field-induced magnetic phase transition at B_<c1>.
- 社団法人日本物理学会の論文
- 2007-10-15
著者
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網代 芳民
京大院理
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KAGEYAMA Hiroshi
Department of Chemistry, Graduate School of Science, Kyoto University
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AJIRO Yoshitami
Department of Chemistry, Graduate School of Science, Kyoto University
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YOSHIMURA Kazuyoshi
Department of Chemistry, Graduate School of Science, Kyoto University
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YOSHIDA Makoto
Institute of Fluid Science, Tohoku University
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網代 芳民
Department Of Chemistry Kyoto University:crest Japan Science And Technology Corporation (jst)
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Ajiro Y
Department Of Chemistry Graduate School Of Science Kyoto University
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陰山 洋
Department Of Chemistry Graduate School Of Science Kyoto University
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Yoshimura Kazuyoshi
Department Of Chemistry Graduate School Of Science Kyoto University
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TAKIGAWA Masashi
Institute for Solid State Physics, University of Tokyo
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YAMAURA Jun-Ichi
Institute for Solid State Physics, University of Tokyo
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KITANO Taro
Department of Chemistry, Graduate School of Science, Kyoto University
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OBA Noriaki
Department of Chemistry, Graduate School of Science, Kyoto University
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OGATA Nobuyuki
Institute for Solid State Physics, University of Tokyo
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ICHIHARA Masaki
Institute for Solid State Physics, University of Tokyo
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Kageyama Hiroshi
Department Of Chemistry Graduate School Of Science Kyoto University
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Yoshimura Kazuyoshi
Department Of Applied Science Tokyo Electrical Engineering College
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Kageyama Hiroshi
Department Of Applied Chemistry Faculty Of Engineering Osaka University
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Yamamura Jun-ichi
Institute For Solid State Physics University Of Tokyo
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Yamaura J
Univ. Tokyo Chiba
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Yamaura Junichi
Materials Design And Characterization Laboratory Institute For Solid State Physics University Of Tok
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Yamaura J
Univ. Tokyo Chiba Jpn
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Ajiro Y
Department Of Physics Kyushu University
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Takigawa Masashi
Institute For Solid State Physics University Of Tokyo
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Yamaura J
Institute For Solid State Physics University Of Tokyo
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Yamaura Jun-ichi
Institute For Solid State Physics The University Of Tokyo
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Kitano Taro
Department Of Chemistry Graduate School Of Science Kyoto University
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Takano M
Institute For Chemical Research Kyoto University
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Takano Mikio
Institute For Integrated Cell-material Sciences Kyoto University
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Ogata Nobuyuki
Institute For Solid State Physics University Of Tokyo
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Oba Noriaki
Department Of Chemistry Graduate School Of Science Kyoto University
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Takigawa Masashi
Institute For Solid State Physics Iniversity Of Tokyo
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Ichihara Masaki
Institute For Solid State Physics The University Of Tokyo
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Ajiro Yoshitami
Department Of Applied Physics Fukui University
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Ajiro Yoshitami
Department Of Applied Physics Faculty Of Engineering Fukui University
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Yasuda Jun
Institute For Solid State Physics University Of Tokyo
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Yoshida Makoto
Institute For Solid State Physics University Of Tokyo
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Yoshida Makoto
Institute For Materials Reserch
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Oba Noriaki
Institute for Solid State Physics, University of Tokyo
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YOSHIDA Makoto
Institute for Solid State Physics, University of Tokyo
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YASUDA Jun
Institute for Solid State Physics, University of Tokyo
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Yoshida Makoto
Institute for Materials Research, Tohoku University, Sendai 980-8577
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