Impacts of f-d Kondo cloud on superconductivity of nickelates

TL;DR

This paper investigates how the f-d Kondo effect influences the electronic structure and superconductivity in nickelates, revealing that the Kondo effect induces a 3D multi-band Fermi surface which can be suppressed to quasi-2D, affecting superconductivity.

Contribution

It demonstrates the role of the f-d Kondo effect in shaping the electronic structure and superconductivity in nickelates, linking strong correlations to Fermi surface topology changes.

Findings

Kondo effect emerges from Nd-4f and Ni-3d electron correlations.

Kondo effect alters Fermi surface topology to 3D multi-band.

Lattice modulation can suppress the Kondo effect, restoring quasi-2D electronic structure.

Abstract

The discovery of superconducting nickelates reignited hope for elucidating the high-$T_{\textrm{c}}$ superconductivity mechanism in the isostructural cuprates. While in the cuprates, the superconducting gap opens up on a single-band of the quasi-2D Fermi surface, the nickelates are known to have 3D nature of electronic structure with multi-band. This raises a serious question about the role of 2D nature for the high-$T_{\textrm{c}}$ superconductivity. Here, employing dynamical mean field theory combined with GW method, we found the Kondo effect driven by the strong correlation of Nd-4$f$ and Ni-3$d$ electrons emerging at low temperature. The Kondo effect modifies the topology of the Fermi surface leading to 3D multi-band nature. Remarkably, the Kondo effect is easily destroyed by lattice modulation, leading to the quasi-2D nature. Our findings clearly explain the inconsistent occurrence of superconductivity and distinct electrical resistivity behavior between NdNiO$_{2}$ bulk and films.