Charge ordering at the interface in (LaMnO${}_3$)${}_{2n}$/(SrMnO${}_3$)${}_n$ superlattices as the origin of their insulating state

Abstract

We have performed ab initio calculations within the LDA+U method in the multilayered system (LaMnO${}_3$)${}_{2n}$ / (SrMnO${}_3$)${}_n$. Our results suggest a charge-ordered state that alternates Mn${}^{3+}$ and Mn${}^{4+}$ cations in a checkerboard in-plane pattern is developed at the interfacial layer, leading to a gap opening. Such an interfacial charge-ordered situation would be the energetically favored reconstruction between LaMnO${}_3$ and SrMnO${}_3$. This helps understanding the insulating behavior observed experimentally in these multilayers at intermediate values of $n$, whose origin is known to be due to some interfacial mechanism.

5 pages, 4 figures

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Cited by in corpus (1)

• Persistent half-metallic ferromagnetism in a (111)-oriented manganite superlattice