Magnetic quantum phase transition in an anisotropic Kondo lattice

TL;DR

This paper investigates the quantum phase transition in an anisotropic Kondo lattice model using extended dynamical mean-field theory, revealing a continuous transition with critical local physics and implications for heavy-fermion materials.

Contribution

It provides a nonperturbative numerical analysis of the quantum phase transition in an anisotropic Kondo lattice, highlighting the critical local physics involved.

Findings

Transition is continuous in both 2D and 3D cases.

Critical local physics characterized by vanishing Kondo scale.

Results are consistent with experimental observations in heavy-fermion systems.

Abstract

The quantum phase transition between paramagnetic and antiferromagnetic phases of the Kondo lattice model with Ising anisotropy in the intersite exchange is studied within the framework of extended dynamical mean-field theory. Nonperturbative numerical solutions at zero temperature point to a continuous transition for both two- and three-dimensional magnetism. In the former case, the transition is associated with critical local physics, characterized by a vanishing Kondo scale and by an anomalous exponent in the dynamics close in value to that measured in heavy-fermion CeCu_{5.9}Au_{0.1}.