Orbital order and possible superconductivity in LaNiO3/LaMO3 superlattices

Abstract

A hypothetical layered oxide La_2NiMO_6 where NiO_2 and MO_2 planes alternate along the c-axis of ABO_3 perovskite lattice is considered theoretically. Here, M denotes a trivalent cation Al, Ga,... such that MO_2 planes are insulating and suppress the c-axis charge transfer. We predict that correlated e_g electrons in the NiO_2 planes develop a planar x^2-y^2 orbital order driven by the reduced dimensionality and further supported by epitaxial strain from the substrate. Low energy electronic states can be mapped to a single-band t-t'-J model, suggesting favorable conditions for high-T_c superconductivity.

4 pages, 4 figures

References in corpus (2)

• Role of magnetic and orbital ordering at the metal-insulator transition in NdNiO3
• Electron correlation and Fermi surface topology of Na${}_x$CoO${}_2$

Cited by in corpus (6)

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• Termination Control of the Interface Dipole in La${}_{0.7}$Sr${}_{0.3}$MnO${}_3$/Nb:SrTiO${}_3$ (001) Schottky Junctions
• Bulk magnetic order in a two dimensional Ni1+/Ni2+ (d9/d8) nickelate, isoelectronic with superconducting cuprates
• Chemical control of orbital polarization in artificially structured transition-metal oxides: La2NiXO6 (X=B, Al, Ga, In) from first principles
• Onset of metallic behavior in strained (LaNiO3)n/(SrMnO3)2 superlattices
• Spin, Orbital and Charge Order at the Interface between Correlated Oxides