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

• ISHIDA Kenji

  Department of Physics, Graduate School of Science, Kyoto University

• HIROI Zenji

  Institute for Solid State Physics, University of Tokyo

• KITAOKA Yoshio

  Department of Materials Engineering Science, Graduate School of Engineering Science, Osaka Universit

• TAKANO Mikio

  Institute for Chemical Research, Kyoto University

• AZUMA Masaki

  Institute for Chemical Research, Kyoto University

• Asayama Kunisuke

  Department of Material Physics, Faculty of Engineering Science, Osaka University

• Asayama Kunisuke

  Department Of Physical Science Graduate School Of Engineering Science Osaka University

• Asayama Kunisuke

  Department Of Material Physics Faculty Of Engineering Science Osaka University

• Kohori Y

  Chiba Univ. Chiba

• Hiroi Zenji

  Institute For Chemical Research Kyoto University

• Takano M

  Institute For Chemical Research Kyoto University

• Takano M

  Kyoto Univ. Kyoto

• Takano Mikio

  Department Of Chemistry Faculty Of Science Konan University

• Takano Mikio

  Institute For Chemical Research (icr) Kyoto University

• Karaki Y

  Department Of Material Physics Faculty Of Engineering Science Osaka University

• Kitaoka Yoshio

  Department Of Material Physics Faculty Of Engineering Science Osaka University

• Azuma M

  Institute For Chemical Research Kyoto University

• Azuma Masaki

  Institute For Chemical Research Kyoto University

• Mitsui Takaya

  Crest Japan Science And Technology Agency:japan Atomic Energy Agency

• Ishida Kenji

  Department Of Orthopaedic Surgery Kochi Medical School

• Arai Masaya

  Department Of Physics Sophia University

• Ishida Kenji

  Department Of Chemical Science And Engineering Graduate School Of Engineering Kobe University

• AZUMA Masaki

  Institute of Chemical Research, Kyoto University:PRESTO, Japan Science and Technology Corporation (JST)

• Asayama Kunisuke

  Department of Material Physics, Faculty of Engineering Science, Osaka University:Presently Professor Emeritus of Osaka University

• Ishida Kenji

  Department of Applied Chemistry, Ibaraki University

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