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

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

2008-02-05

arxiv.org/abs/0802.0604v2

Phys. Rev. Lett. 100, 217202 (2008)

Physics

Condensed Matter

Materials Science

Scientific paper

10.1103/PhysRevLett.100.217202

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.

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