2001 年 70 巻 11 号 p. 3377-3384
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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