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    Direct transition from a disordered to a multiferroic phase on a triangular lattice

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    Broholm Direct 2007.pdf (901.9Kb)
    Date
    2007-06-29
    Author
    Kenzelmann, M.
    Lawes, G.
    Harris, A. B.
    Gasparovic, G.
    Broholm, C.
    Ramirez, A. P.
    Jorge, G.A.
    Jaime, M.
    Park, S.
    Huang, Q.
    Shapiro, A. Y.
    Demianets, L. A.
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    Abstract
    We report the first direct transition from a paramagnetic and paraelectric phase to an incommensurate multiferroic in the triangular lattice antiferromagnet RbFe(MoO4)2. Ferroelectricity is observed only when the magnetic structure has chirality and breaks inversion symmetry. A Landau expansion of symmetry-allowed terms in the free energy demonstrates that chiral magnetic order can give rise to a pseudoelectric field, whose temperature dependence agrees with experiment.
    URI
    http://jhir.library.jhu.edu/handle/1774.2/33737
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    • Condensed Matter Physics

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