Electronic and Magnetic Structure of the (LaMnO${}_3$)${}_{2n}$/(SrMnO${}_3$)${}_n$ Superlattices

Abstract

We study the magnetic structure of the (LaMnO${}_3$)${}_{2n}$/(SrMnO${}_3$)${}_n$ superlattices from density-functional calculations. In agreement with the experiments, we find that the magnetism changes with the layer thickness `n'. The reason for the different magnetic structures is shown to be the varying potential barrier across the interface, which controls the leakage of the Mn-e${}_g$ electrons from the LMO side to the SMO side. This in turn affects the interfacial magnetism via the carrier-mediated Zener double exchange. For n=1 superlattice, the Mn-e${}_g$ electrons are more or less spread over the entire lattice, so that the magnetic behavior is similar to the equivalent alloy compound La${}_{2/3}$Sr${}_{1/3}$MnO${}_3$. For larger n, the e${}_g$ electron transfer occurs mostly between the two layers adjacent to the interface, thus leaving the magnetism unchanged and bulk-like away from the interface region.

5 pages, 5 figures

References in corpus (5)

• The metal-insulator transition and its relation to magnetic structure in (LaMnO3)2n/(SrMnO3)n superlattices
• Electronic reconstruction at SrMnO3-LaMnO3 superlattice interfaces
• Effects of Strain on Orbital Ordering and Magnetism at the Perovskite Oxide Interfaces: LaMnO${}_3$/SrMnO${}_3$
• Magnetically asymmetric interfaces in a (LaMnO${}_3$)/(SrMnO${}_3$) superlattice due to structural asymmetries
• Ab-initio electronic and magnetic structure in La_0.66Sr_0.33MnO_3: strain and correlation effects

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