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Heterostructures of mixed-valence manganites are still under intensescrutiny, due to the occurrence of exotic quantum phenomena linked toelectronic correlation and interfacial composition. For instance, if twoanti-ferromagnetic insulators as LaMnO$_3$ and SrMnO$_3$ are grown in a(001)-oriented superlattice, a half-metallic ferromagnet may form, providedthat the thickness is sufficiently small to allow tunneling across interfaces.In this article, we employ electronic structure calculations to show that allthe layers of a (111)-oriented LaMnO$_3$|SrMnO$_3$ superlattice retain ahalf-metallic ferromagnetic character for a much larger thickness than in its(001) counterpart. This behavior is shown to be linked to the charge transferacross the interface, favored by the octahedral connectivity between thelayers. This also results in a symmetry-induced quenching of the Jahn-Tellerdistortions, which are replaced by breathing modes. The latter are coupled tocharge and spin oscillations, whose components have a pure e g character. Mostinterestingly, the magnetization reaches its maximum value inside the LaMnO$_3$region and not at the interface, which is fundamentally different from whatobserved for the (001) orientation. The analysis of the inter-atomic exchangecoupling shows that the magnetic order arises from the double-exchangemechanism, despite competing interactions inside the SrMnO$_3$ region. Finally,the van Vleck distortions and the spin oscillations are found to be cruciallyaffected by the variation of Hund's exchange and charge doping, which allows usto speculate that our system behaves as a Hund's metal, creating an interestingconnection between manganites and nickelates.

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