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    Phys Rev Lett. 2007 Feb 16;98(7):077204. Epub 2007 Feb 13.

    Quantum magnetism in the paratacamite family: towards an ideal kagomé lattice.

    Mendels P, Bert F, de Vries MA, Olariu A, Harrison A, Duc F, Trombe JC, Lord JS, Amato A, Baines C.

    Source

    Laboratoire de Physique des Solides, UMR CNRS 8502, Université Paris-Sud, 91405 Orsay, France.

    Abstract

    We report muon spin rotation measurements on the S=1/2 (Cu2+) paratacamite ZnxCu4-x(OH)6Cl2 family. Despite a Weiss temperature of approximately -300 K, the x=1 compound is found to have no transition to a magnetic frozen state down to 50 mK as theoretically expected for the kagomé Heisenberg antiferromagnet. We find that the limit between a dynamical and a partly frozen ground state occurs around x=0.5. For x=1, we discuss the relevance to a singlet picture.

    PMID:
    17359056
    [PubMed]

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