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

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arxiv cond-mat/0111127 v2 pith:DXFX4ZDW submitted 2001-11-08 cond-mat.str-el

Z. Hiroi , M. Hanawa , N. Kobayashi , M. Nohara , H. Takagi , Y. Kato , M. Takigawa This is my paper
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keywords volborthitecu3v2o7kagome-likelatticelong-rangequantumantiferromagneticclassical
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A novel cuprate Volborthite, Cu3V2O7(OH)2-2H2O, containing an S-1/2 (Cu 2+ spin) kagome-like lattice is studied by magnetic susceptibility, specific heat, and 51 V 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 kagome-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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