Charge order versus Zener polarons: ferroelectricity in manganites
Efremov, Dmitry V. · Brink, Jeroen van den · Khomskii, Daniel I.
Original · EN
We show that in manganites close to half-doping novel non-bipartite magnetic phases appear due to the interplay between double exchange, superexchange and orbital ordering. In considerable part of the phase diagram the groundstate has a magnetic order that is intermediate between the canonical magnetic CE-phase and a state that we identify as the recently observed Zener polaron state. The intermediate phase shows a type of charge ordering that breaks inversion symmetry and is therefore predicted to be ferroelectric.
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