Spin Gap Behavior in Ladder-Type of Quasi-One-Dimensional Spin (S=1/2) System SrCu_2O_3
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概要
- 論文の詳細を見る
Low-energy spin excitation in a spin S=1/2 two-leg ladder system SrCu_2O_3 has been investigated by Cu NMR. From an activated decrease of the nuclear-spin lattice relaxation rate, 1/T_1, in a T-range of 100-300K, a spin gap, Δ, is demonstrated to open with a value of 680K, which is in quantitative agreement with the theoretical value ofΔ 〜0.5J= 650K, if the same value of 1300K as in the square lattice system is used as the antiferromagnetic exchange coupling constant, J. It is furthermore deduced from the measurement of the spin-echo decay rate, 1/T_<2G>, that a magnetic coherence length, ζ/a (a : lattice spacing between Cu atoms along the chain), remains finite with (ζ/a)〜13, comparable to a value in La_2CuO_4 near T_N. This class of cuprate is thus a frustrated quntum antiferromagnet (AF) with a spin gap.
- 社団法人日本物理学会の論文
- 1994-09-15
著者
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ISHIDA Kenji
Department of Physics, Graduate School of Science, Kyoto University
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HIROI Zenji
Institute for Solid State Physics, University of Tokyo
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KITAOKA Yoshio
Department of Materials Engineering Science, Graduate School of Engineering Science, Osaka Universit
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TAKANO Mikio
Institute for Chemical Research, Kyoto University
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AZUMA Masaki
Institute for Chemical Research, Kyoto University
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Asayama Kunisuke
Department of Material Physics, Faculty of Engineering Science, Osaka University
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Asayama Kunisuke
Department Of Physical Science Graduate School Of Engineering Science Osaka University
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Asayama Kunisuke
Department Of Material Physics Faculty Of Engineering Science Osaka University
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Kohori Y
Chiba Univ. Chiba
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Hiroi Zenji
Institute For Chemical Research Kyoto University
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Takano M
Institute For Chemical Research Kyoto University
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Takano M
Kyoto Univ. Kyoto
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Takano Mikio
Department Of Chemistry Faculty Of Science Konan University
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Takano Mikio
Institute For Chemical Research (icr) Kyoto University
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Karaki Y
Department Of Material Physics Faculty Of Engineering Science Osaka University
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Kitaoka Yoshio
Department Of Material Physics Faculty Of Engineering Science Osaka University
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Azuma M
Institute For Chemical Research Kyoto University
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Azuma Masaki
Institute For Chemical Research Kyoto University
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Mitsui Takaya
Crest Japan Science And Technology Agency:japan Atomic Energy Agency
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Ishida Kenji
Department Of Orthopaedic Surgery Kochi Medical School
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Arai Masaya
Department Of Physics Sophia University
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Ishida Kenji
Department Of Chemical Science And Engineering Graduate School Of Engineering Kobe University
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AZUMA Masaki
Institute of Chemical Research, Kyoto University:PRESTO, Japan Science and Technology Corporation (JST)
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Asayama Kunisuke
Department of Material Physics, Faculty of Engineering Science, Osaka University:Presently Professor Emeritus of Osaka University
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Ishida Kenji
Department of Applied Chemistry, Ibaraki University
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