Orbital order and possible superconductivity in LaNiO3/LaMO3 superlattices

Details Orbital order and possible superconductivity in LaNiO3/LaMO3 superlattices Orbital order and possible superconductivity in LaNiO3/LaMO3 superlattices

2010-05-10

arxiv.org/abs/1005.1464v1

Phys. Rev. Lett. 100, 016404 (2008)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.100.016404

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.

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