Publication details

Orbital Order and Possible Superconductivity in LaNiO3/LaMO3 Superlattices



Year of publication 2008
Type Article in Periodical
Magazine / Source Physical Review Letters
MU Faculty or unit

Faculty of Science

Field Solid matter physics and magnetism
Keywords orbital order; superlattices; superconductivity; strong correlations
Description A hypothetical layered oxide La2NiMO6 where NiO2 and MO2 planes alternate along the c axis of ABO3 perovskite lattice is considered theoretically. Here, M denotes a trivalent cation Al, Ga, etc such that MO2 planes are insulating and suppress the c-axis charge transfer. We predict that correlated eg electrons in the NiO2 planes develop a planar x2-y2 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-Tc superconductivity.
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