Evolution of magnetic phases and orbital occupation in (SrMnO3)n/(LaMnO3)2n superlattices

Abstract

The magnetic and electronic modifications induced at the interfaces in (SrMnO${}_3$)${}_n$/(LaMnO${}_3$)${}_{2n}$ superlattices have been investigated by linear and circular magnetic dichroism in the Mn L${}_{2,3}$ x-ray absorption spectra. Together with theoretical calculations, our data demonstrate that the charge redistribution across interfaces favors in-plane ferromagnetic (FM) order and $e_g(x^2-y^2)$ orbital occupation, in agreement with the average strain. Far from interfaces, inside LaMnO${}_3$, electron localization and local strain favor antiferromagnetism (AFM) and $e_g(3z^2-r^2)$ orbital occupation. For $n=1$ the high density of interfacial planes ultimately leads to dominant FM order forcing the residual AFM phase to be in-plane too, while for $n\ge 5$ the FM layers are separated by AFM regions having out-of-plane spin orientation.

accepted for publication as a Rapid Communication in Physical Review B

References in corpus (4)

• Electronic reconstruction at SrMnO3-LaMnO3 superlattice interfaces
• Metal-insulator transition in $(LaMn{O}_3{)}_{2n}/(SrMn{O}_3{)}_n$ superlattices
• Magnetically asymmetric interfaces in a (LaMnO${}_3$)/(SrMnO${}_3$) superlattice due to structural asymmetries
• Theory of Manganite Superlattice

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