Role of the Dzyaloshinskii-Moriya interaction in multiferroic perovskites

Details Role of the Dzyaloshinskii-Moriya interaction in multiferroic perovskites Role of the Dzyaloshinskii-Moriya interaction in multiferroic perovskites

2005-08-02

arxiv.org/abs/cond-mat/0508075v2

Phys. Rev. B 73, 094434 (2006)

Physics

Condensed Matter

Strongly Correlated Electrons

6 pages, 5 figures

Scientific paper

10.1103/PhysRevB.73.094434

With the perovskite multiferroic RMnO3 (R = Gd, Tb, Dy) as guidance, we argue that the Dzyaloshinskii-Moriya interaction (DMI) provides the microscopic mechanism for the coexistence and strong coupling between ferroelectricity and incommensurate magnetism. We use Monte-Carlo simulations and zero temperature exact calculations to study a model incorporating the double-exchange, superexchange, Jahn-Teller and DMI terms. The phase diagram contains a multiferroic phase between A and E antiferromagnetic phases, in excellent agreement with experiments.

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