Heavy antiferromagnetic phases in Kondo lattices

TL;DR

This paper introduces a microscopic mechanism for stable coexistence of Kondo effect and antiferromagnetism in heavy-fermion systems, highlighting the role of long-range electron hopping in a 2D lattice model.

Contribution

It demonstrates how long-range electron hopping stabilizes a heavy antiferromagnetic phase using a modified slave-boson mean-field approach.

Findings

Long-range hopping leads to robust antiferromagnetic Kondo states.

Analysis of phase stability across parameter ranges.

Discussion of experimental relevance to heavy fermion compounds.

Abstract

We propose a microscopic physical mechanism that stabilizes coexistence of the Kondo effect and antiferromagnetism in heavy-fermion systems. We consider a two-dimensional quantum Kondo-Heisenberg lattice model and show that long-range electron hopping leads to a robust antiferromagnetic Kondo state. By using a modified slave-boson mean-field approach we analyze the stability of the heavy antiferromagnetic phase across a range or parameters, and discuss transitions between different phases. We also address connection to experiments on heavy fermion compounds.