Coupling of replicate order-parameters in incommensurate multiferroics

Details Coupling of replicate order-parameters in incommensurate multiferroics Coupling of replicate order-parameters in incommensurate multiferroics

2011-02-08

arxiv.org/abs/1102.1575v1

Physics

Condensed Matter

Materials Science

Scientific paper

The specific properties of incommensurate multiferroic phases resulting from the coupling of order-parameter replicates are worked out using the illustrative example of iron vanadate. The dephasing between the order-parameter copies induces an additional broken symmetry phase corresponding to the lowest symmetry of the system and varies critically at the transition to the multiferroic phase. It reflects the temperature dependence of the angle between paired spins in the antiferromagnetic spiral structure. Expressing the transition order-parameters in terms of spin-density waves allows showing that isotropic exchange interactions contribute to the stabilization of the ferroelectric phase.

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