Extended Dynamical Mean Field Theory Study of the Periodic Anderson Model

TL;DR

This paper uses Extended Dynamical Mean Field Theory with Quantum Monte Carlo to study how competing Kondo and RKKY interactions influence electronic and magnetic properties in the periodic Anderson model, revealing separate magnetic and quasiparticle transitions.

Contribution

It provides a detailed EDMFT analysis of the periodic Anderson model, highlighting the distinct nature of magnetic and quasiparticle transitions in heavy fermion systems.

Findings

Heavy quasiparticles unbind as RKKY increases

Magnetic order emerges at a critical RKKY coupling

Transitions occur at different points, not a local quantum critical point

Abstract

We investigate the competition of the Kondo and the RKKY interactions in heavy fermion systems. We solve a periodic Anderson model using Extended Dynamical Mean Field Theory (EDMFT) with QMC. We monitor simultaneously the evolution of the electronic and magnetic properties. As the RKKY coupling increases the heavy fermion quasiparticle unbinds and a local moment forms. At a critical RKKY coupling there is an onset of magnetic order. Within EDMFT the two transitions occur at different points and the disapparence of the magnetism is not described by a local quantum critical point.