Multichannel Kondo impurities in superconductors

TL;DR

This paper investigates how multichannel Kondo impurities affect superconductivity, highlighting their role as pairbreakers in the strong coupling regime and proposing measurements of critical temperature suppression to identify such impurities.

Contribution

It introduces the concept of multichannel Kondo impurities as pairbreakers in superconductors and suggests experimental methods to detect their presence.

Findings

Multichannel Kondo impurities suppress superconducting transition temperature.

They act as pairbreakers in the strong coupling regime.

Measurement of Tc suppression can identify these impurities.

Abstract

We discuss the effect of multichannel Kondo impurities on superconductivity. In the strong coupling regime such impurities are pairbreakers, in contrast to the ordinary Kondo effect. Measurements of $T_c$-suppression may help in identifying impurities displaying this more exotic exchange coupling to the conduction band.