Orbital Order and Possible Superconductivity in LaNiO3/LaMO3 Superlattices

Jiří Chaloupka; Giniyat Khaliullin

doi:10.1103/PhysRevLett.100.016404

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Orbital Order and Possible Superconductivity in LaNiO3/LaMO3 Superlattices

Jiří Chaloupka, Giniyat Khaliullin

DOI 10.1103/PhysRevLett.100.016404 · Physical Review Letters

T1

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Abstract

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,… 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.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
La2NiMO6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
La2NiTiO6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
La2NiGaO6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown