Superconductivity in the Kondo lattice model

TL;DR

This paper investigates superconductivity in the Kondo lattice model with attractive interactions, revealing how low-energy scales and superconducting transitions depend on electron interactions and Kondo exchange.

Contribution

It introduces a study of superconductivity within the Kondo lattice model considering attractive interactions using dynamical mean-field theory and numerical renormalization group methods.

Findings

Superconducting phase can occur alongside normal and magnetic phases.

Low-energy scale is highly sensitive to conduction-electron interactions.

Superconducting transition depends on the interplay between attractive interaction and Kondo exchange.

Abstract

We study the Kondo lattice model with additional attractive interaction between the conduction electrons within the dynamical mean-field theory using the numerical renormalization group to solve the effective quantum impurity problem. In addition to normal-state and magnetic phases we also allow for the occurrence of a superconducting phase. In the normal phase we observe a very sensitive dependence of the low-energy scale on the conduction-electron interaction. We discuss the dependence of the superconducting transition on the interplay between attractive interaction and Kondo exchange.