Direct Transition From a Disordered to a Multiferroic Phase on a Triangular Lattice

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Physics
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Kenzelmann, Michel
Lawes, Gavin J
Gašparović, Goran
Broholm, Collin L
Ramirez, Arthur P
Jorge, Guillermo A
Jaime, Marcelo
Park, Sungil
Huang, Qingzhen
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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.

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2007-06-29
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Physical Review Letters
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