Spin-1/2 Kagome-Like Lattice in Volborthite Cu3V2O7(OH)2 2H2O.

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  • Hiroi Zenji
    Institute for Solid State Physics, University of Tokyo, Kashiwanoha, Kashiwa, Chiba 277-8581
  • Hanawa Masafumi
    Institute for Solid State Physics, University of Tokyo, Kashiwanoha, Kashiwa, Chiba 277-8581
  • Kobayashi Naoya
    Toda Kogyo Corp., Meijishinkai, Otake, Hiroshima 739-0652
  • Nohara Minoru
    Graduate School of Frontier Sciences, University of Tokyo, Hongo, Bukyo-ku, Tokyo 113-8656
  • Takagi Hidenori
    Graduate School of Frontier Sciences, University of Tokyo, Hongo, Bukyo-ku, Tokyo 113-8656
  • Kato Yoshitomo
    Institute for Solid State Physics, University of Tokyo, Kashiwanoha, Kashiwa, Chiba 277-8581
  • Takigawa Masashi
    Institute for Solid State Physics, University of Tokyo, Kashiwanoha, Kashiwa, Chiba 277-8581

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  • Spin-1/2 <i>Kagomé</i>-Like Lattice in Volborthite Cu<sub>3</sub>V<sub>2</sub>O<sub>7</sub>(OH)<sub>2</sub>·2H<sub>2</sub>O

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A novel cuprate Volborthite, Cu3V2O7(OH)2·2H2O, containing an S-1/2 (Cu2+ spin) kagomé-like lattice is studied by magnetic susceptibility, specific heat, and 51V NMR measurements. Signs for neither long-range order nor spin-gapped singlet ground states are detected down to 1.8 K, in spite of large antiferromagnetic couplings of ∼100 K between Cu spins forming a two-dimensional kagomé-like network. It is suggested that Volborthite represents a system close to a quantum critical point between classical long-range ordered and quantum disordered phases.

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