Optical study of interactions in a d-electron Kondo lattice with ferromagnetism

TL;DR

This paper investigates the optical, transport, and thermodynamic properties of Yb$_{14}$MnSb$_{11}$, revealing it as the first ferromagnetic Kondo lattice in the underscreened limit, explained by combined Kondo and Jahn-Teller effects.

Contribution

It introduces Yb$_{14}$MnSb$_{11}$ as the first ferromagnetic Kondo lattice in the underscreened limit and explains its behavior through a combined Kondo and Jahn-Teller effects model.

Findings

Yb$_{14}$MnSb$_{11}$ is a ferromagnetic Kondo lattice in the underscreened limit

Optical and transport data are explained by combined Kondo and Jahn-Teller effects

First comprehensive optical, transport, and thermodynamic study of this compound

Abstract

We report on a comprehensive optical, transport and thermodynamic study of the Zintl compound Yb$_{14}$MnSb$_{11}$, demonstrating that it is the first ferromagnetic Kondo lattice compound in the underscreened limit. We propose a scenerio whereby the combination of Kondo and Jahn-Teller effects provides a consistent explanation of both transport and optical data.