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Role of the Dzyaloshinskii-Moriya interaction in multiferroic perovskites

Research paper by I. A. Sergienko, E. Dagotto

Indexed on: 24 Feb '06Published on: 24 Feb '06Published in: Physics - Strongly Correlated Electrons



Abstract

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.