Ferromagnetism and Kondo Insulator Behavior in the Disordered Periodic Anderson Model

TL;DR

This paper investigates how binary alloy disorder influences ferromagnetism and Kondo insulator behavior in the periodic Anderson model, revealing disorder-induced enhancement of Curie temperature and the emergence of alloy Kondo insulators.

Contribution

It provides a detailed analysis of disorder effects on ferromagnetic phases and introduces the concept of alloy Kondo insulators within the model.

Findings

Disorder in the conduction band enhances the Curie temperature.

An alloy Kondo insulator can emerge at non-integer filling.

The effects are explained by a simple theoretical ansatz.

Abstract

The effect of binary alloy disorder on the ferromagnetic phases of f-electron materials is studied within the periodic Anderson model. We find that disorder in the conduction band can drastically enhance the Curie temperature due to an increase of the local f-moment. The effect may be explained qualitatively and even quantitatively by a simple theoretical ansatz. The emergence of an alloy Kondo insulator at non-integer filling is also pointed out.