Model construction and a possibility of cuprate-like pairing in a new d9 nickelate superconductor (Nd,Sr)NiO2

Abstract

Effective models are constructed for a newly discovered superconductor (Nd,Sr)NiO2, which has been considered as a possible nickelate analogue of the cuprates owing to the d9 electron configuration. Estimation of the effective interaction, which turns out to require a multiorbital model that takes account of all the orbitals involved on the Fermi surface, shows that the effective interactions are significantly larger than in the cuprates. A fluctuation exchange study for the model indicates that dx2-y2-wave superconductivity is likely to occur as in the cuprates, where the transition temperature in the nickelate can be lower from the cuprates due to the larger interaction and narrower bandwidth.

Contains three figures in the main text. Version 1 and 2 are essentially the same, except that Fig. S3-S5 are newly added in the supplemental material

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• Electronic structure, dimer physics, orbital-selective behavior, and magnetic tendencies in the bilayer nickelate superconductor La${}_3$Ni${}_2$O${}_7$ under pressure
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• Structural phase transition, $s_{\pm }$-wave pairing and magnetic stripe order in the bilayered nickelate superconductor La${}_3$Ni${}_2$O${}_7$ under pressure
• Superconductivity in infinite-layer nickelates
• Charge density waves in infinite-layer NdNiO${}_2$ nickelates
• Electronic structure of rare-earth infinite-layer ReNiO2 (Re=La, Nd)
• Hund's metal physics: from SrNiO${}_2$ to NdNiO${}_2$
• Intrinsic magnetism in superconducting infinite-layer nickelates
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• Hund electronic correlation in La${}_3$Ni${}_2$O${}_7$ under high pressure
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