Electronic and Magnetic Properties of RMnO3/AMnO3 Heterostructures
Abstract
In this paper, we investigate the ground state properties of the RMnO3/AMnO3 (RMO/AMO) heterostructures (R=trivalent cation, and A=divalent cation) by using a two-orbital double-exchange model supplemented by the Poisson's equation. We find that the state stabilized near the interface of the heterostructure is similar to the state of the bulk compound (R,A)MO at electronic density close to 0.5. Depending on the bandwidth it will be a charge and orbital ordered CE state or an A-AF state with x2-y2 orbital order. Our results can explain some properties of long-period superlattices. As another interesting result, we find exotic intermediate states stabilized in between the interface and the bulk-like regimes of the heterostructure. For instance, a spin "canted CE" state and others. They may not have an analog in experimentally known bulk phase diagrams, but provide a natural interpolation between magnetically-ordered states that are stable in the bulk at different electronic densities.