Mean Field Description of Kondo-Stabilized Spin Liquid in Kondo Lattice with Heavy Fermions

TL;DR

This paper presents a mean field theory explaining how Kondo lattices with nearly integer valence can stabilize a spin liquid state with neutral fermions, highlighting the competition between Kondo scattering and exchange interactions.

Contribution

It introduces a microscopic mean field model for the formation of a spin liquid in Kondo lattices, emphasizing the separation of spin and charge excitations.

Findings

Stabilization of a spin liquid with neutral fermions in Kondo lattices.

Separation of spin and charge excitations with Fermi-like spectra.

Discussion of strong antiferromagnetic fluctuations.

Abstract

Microscopic mechanism of forming the spin liquid of neutral fermions in Kondo lattices with nearly integer valence of the f-electrons in presented. It is shown that the competition between the Kondo scattering and the indirect exchange interaction can result in stabilization of a state with separated spin and charge excitations with a Fermi-type spectrum for both of them. The origin of strong antiferromagnetic fluctuations is briefly discussed.