Magnetic properties and pseudogap formation in infinite-layer nickelates: insights from the single-band Hubbard model

TL;DR

This study investigates the magnetic and pseudogap phenomena in infinite-layer nickelates using advanced theoretical models, revealing strong correlations and pseudogap formation similar to cuprates.

Contribution

It applies cellular dynamical mean-field theory and dynamical vertex approximation to analyze the doping-dependent magnetic and spectral properties of LaNiO₂.

Findings

Pseudogap forms at strong coupling with doping.

Magnetic correlation length is a few lattice spacings.

Pseudogap behavior is analogous to cuprates.

Abstract

We study the magnetic and spectral properties of a single-band Hubbard model for the infinite-layer nickelate compound LaNiO$_2$. As spatial correlations turn out to be the key ingredient for understanding its physics, we use two complementary extensions of the dynamical mean-field theory to take them into account: the cellular dynamical mean-field theory and the dynamical vertex approximation. Additionally to the systematic analysis of the doping dependence of the non-Curie-Weiss behavior of the uniform magnetic susceptibility, we provide insight into its relation to the formation of a pseudogap regime by the calculation of the one-particle spectral function and the magnetic correlation length. The latter is of the order of a few lattice spacings when the pseudogap opens, indicating a strong-coupling pseudogap formation in analogy to cuprates.