Order Parameters and Phase Diagram of Multiferroic RMn${}_2$O${}_5$

Abstract

The generic magnetic phase diagram of multiferroic RMn${}_2$O${}_5$ (with R=Y, Ho, Tb, Er, Tm), which allows different sequences of ordered magnetic structures for different R's and different control parameters, is described using order parameters which explicitly incorporate the magnetic symmetry. A phenomenological magneto-electric coupling is used to explain why some of these magnetic phases are also ferroelectric. Several new experiments, which can test this theory, are proposed.

References in corpus (7)

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• Direct transition from a disordered to a multiferroic phase on a triangular lattice
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Cited by in corpus (6)

• A Neutron diffraction study of multiferroics RMn2O5
• Electromagnons in multiferroic RMn2O5 compounds and their microscopic origin
• Complex Spin Structures and Origin of the Magneto-Electric Coupling in YMn2O5
• Effect of Inversion Symmetry on Incommensurate Order in Multiferroic RMn2O5, R=rare earth
• Order Parameters and Phase Diagrams of Multiferroics
• Theory of magnetic field-induced metaelectric critical end point in BiMn${}_2$O${}_5$