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    Phys Rev Lett. 2008 Mar 21;100(11):117202. Epub 2008 Mar 19.

    Nature of the spin dynamics and 1/3 magnetization plateau in azurite.

    Rule KC, Wolter AU, Süllow S, Tennant DA, Brühl A, Köhler S, Wolf B, Lang M, Schreuer J.

    Source

    Hahn-Meitner-Institut GmbH, D-14109 Berlin, Germany.

    Abstract

    We present a specific heat and inelastic neutron scattering study in magnetic fields up into the 1/3 magnetization plateau phase of the diamond chain compound azurite Cu3(CO3)2(OH)2. We establish that the magnetization plateau is a dimer-monomer state, i.e., consisting of a chain of S=1/2 monomers, which are separated by S=0 dimers on the diamond chain backbone. The effective spin couplings Jmono/kB=10.1(2) K and Jdimer/kB=1.8(1) K are derived from the monomer and dimer dispersions. They are associated to microscopic couplings J1/kB=1(2) K, J2/kB=55(5) K and a ferromagnetic J3/kB=-20(5) K, possibly as result of dz2} orbitals in the Cu-O bonds providing superexchange (SE) pathways with JSE=6.5 K.

    PMID:
    18517818
    [PubMed]

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