Instabilities of the Abrikosov-Suhl resonance

TL;DR

This paper explores how instabilities in the Abrikosov-Suhl resonance can cause new fixed point behaviors in the Kondo effect, potentially leading to odd-frequency superconductivity and non-Fermi liquid states.

Contribution

It introduces the concept that resonance instabilities can induce novel fixed points and unconventional superconductivity in Kondo lattice systems.

Findings

Proposal of a pairing component leading to odd-frequency superconductivity

Discussion of experimental methods to distinguish pairing types

Connection between resonance instabilities and non-Fermi liquid behavior

Abstract

We consider the possibility that instabilities of the Abrikosov-Suhl resonance lead to new fixed point behavior of the Kondo effect in a lattice environment. In one scenario, a pairing component to the resonant scattering develops in the Kondo lattice, leading to an odd frequency superconductor. We discuss experiments that can discriminate between this picture and d-wave pairing, and its relationship to the non Fermi liquid fixed point of the overscreened Kondo model.