Dynamical Mean Field Theory of the Antiferromagnetic Metal to Antiferromagnetic Insulator Transition

TL;DR

This paper investigates the transition from antiferromagnetic metal to insulator using dynamical mean field theory, revealing different behaviors depending on magnetic correlation strength and frustration.

Contribution

It introduces a detailed analysis of the transition mechanism, distinguishing between a renormalized Slater scenario and a weakly first-order transition based on correlation strength.

Findings

Strong correlations lead to a continuous gap closure with renormalized Slater behavior.

Weak correlations result in a weakly first-order transition.

Magnetic frustration influences the nature of the transition.

Abstract

We study the antiferromagnetic metal to antiferromagnetic insulator using dynamical mean field theory and exact diagonalization methods. We find two qualitatively different behaviors depending on the degree of magnetic correlations. For strong correlations combined with magnetic frustration, the transition can be described in terms of a renormalized slater theory, with a continuous gap closure driven by the magnetism but strongly renormalized by correlations. For weak magnetic correlations, the transition is weakly first order.