Robust d_x²-y²-wave superconductivity of infinite-layer nickelates

2019/09/30 by Xianxin Wu, Domenico Di Sante, Tilman Schwemmer +4 · 1 citation
Physics and Astronomy · #cond-mat.supr-con

paper · pdf · doi:10.1103/physrevb.101.060504

published as Phys. Rev. B 101, 060504(R) (2020) · 5 pages, 4 figures+ 5 pages, PRB Editors' suggestion

arxiv created 2020/04/28 · arxiv updated 2020/04/29

Abstract

Motivated by the recent observation of superconductivity in strontium doped NdNiO₂, we study the superconducting instabilities in this system from various vantage points. Starting with first-principles calculations, we construct two distinct tight-binding models, a simpler single-orbital as well as a three-orbital model, both of which capture the key low energy degrees of freedom to varying degree of accuracy. We study superconductivity in both models using the random phase approximation (RPA). We then analyze the problem at stronger coupling, and study the dominant pairing instability in the associated t-J model limit. In all instances, the dominant pairing tendency is in the d_x²-y² channel, analogous to the cuprate superconductors.

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