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

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Title: Direct transition from a disordered to a multiferroic phase on a triangular lattice
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.
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
Date: 2007-06-29
Citation: Physical Review Letters 29 June 2007, vol.98, no.26, pp. 267205/1-4
Subject: triangular lattice
direct transition
chirality
broken inversion symmetry
chiral magnetic order
pseudoelectric field
rubidium compounds
paramagnetic materials
magnetc transitions
ferroelectric transitions
dielectric materials
multiferroics
magnetic transitions
iron compounds
free energy
Landau expansion
ferroelectricity
RbFe(MoO4)2

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