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

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