Robust d-wave Pairing Correlations in the Heisenberg Kondo Lattice Model

TL;DR

This paper investigates an extended Kondo lattice model with antiferromagnetic coupling, revealing a robust d-wave superconducting phase near half-filling driven by magnetic fluctuations, bridging theory and heavy fermion experiments.

Contribution

It introduces an extended model with antiferromagnetic coupling and demonstrates the emergence of d-wave pairing correlations, advancing understanding of superconductivity in heavy fermion systems.

Findings

Existence of a d-wave superconducting phase near half-filling

Superconductivity mediated by antiferromagnetic fluctuations

Closer alignment with experimental observations in heavy fermion materials

Abstract

The Kondo lattice model enlarged by an antiferromagnetic coupling $J_{\rm AF}$ between the localized spins is here investigated using computational techniques. Our results suggest the existence of a d-wave superconducting phase close to half-filling mediated by antiferromagnetic fluctuations. This establishes a closer connection between theory and heavy fermion experiments than currently provided by the standard Kondo lattice model with $J_{\rm AF}$=0.