Date of this Version
Physical Review Letters
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.
Kenzelmann, M., Lawes, G. J., Harris, A., Gašparović, G., Broholm, C. L., Ramirez, A. P., Jorge, G. A., Jaime, M., Park, S., Huang, Q., Shapiro, A., & Demianets, L. A. (2007). Direct Transition From a Disordered to a Multiferroic Phase on a Triangular Lattice. Physical Review Letters, 98 267205-1-267205-4. http://dx.doi.org/10.1103/PhysRevLett.98.267205
Date Posted: 20 August 2015
This document has been peer reviewed.