Crystal Distortion and the Two-Channel Kondo Effect

TL;DR

This paper investigates how crystal distortions influence the two-channel Kondo effect, revealing that Jahn-Teller interactions alter the energy scale and destabilize non-Fermi-liquid properties in impure crystals.

Contribution

It introduces a model combining the two-channel Kondo effect with crystal distortions and analyzes their impact on non-Fermi-liquid behavior and energy scales.

Findings

Jahn-Teller interactions modify the characteristic energy scale.

Non-Fermi-liquid properties are destabilized by impurities.

Energy scale tends to zero with static Jahn-Teller limit.

Abstract

We study a simple model of the two-channel Kondo effect in a distorted crystal. This model is then used to investigate the interplay of the Kondo and Jahn-Teller effects, and also the Kondo effect in an impure crystal. We find that the Jahn-Teller interaction modifies the characteristic energy scale of the system below which non-Fermi-liquid properties of the model become apparent. The modified energy scale tends to zero as the limit of a purely static Jahn-Teller effect is approached. We find also that the non-Fermi-liquid properties of the quadrupolar Kondo effect are not stable against crystal distortion caused by impurities.