Electronic and Magnetic Properties of ${\mathrm{RMnO}}_3/{\mathrm{AMnO}}_3$ Heterostructures

Abstract

In this paper, we investigate the ground state properties of the ${\mathrm{RMnO}}_3/{\mathrm{AMnO}}_3$ ($RMO/AMO$) 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 $(\mathrm{R},\mathrm{A})\mathrm{MO}$ 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 $x^2-y^2$ 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.

12 pages, 12 figures

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