Magnetic properties of the extended periodic Anderson model

TL;DR

This paper investigates the magnetic phase diagram of the extended periodic Anderson model, revealing competing magnetic states, non-monotonic magnetization behavior, and a novel magnetic metallic phase stabilized by Hund's coupling and hybridization.

Contribution

It introduces a combined DMFT and NRG approach to analyze magnetic phases in the extended periodic Anderson model, highlighting the emergence of a new magnetic metallic state.

Findings

Identification of competing magnetic states and Kondo insulator

Observation of non-monotonic temperature-dependent magnetization

Discovery of a magnetic metallic phase at half filling

Abstract

We study magnetic properties of the extended periodic Anderson model, which includes electron correlations within and between itinerant and localized bands. By combining dynamical mean-field theory with the numerical renormalization group we calculate the sublattice magnetization and the staggered susceptibility to determine the phase diagram in the particle-hole symmetric case. We find that two kinds of magnetically ordered states compete with the Kondo insulating state at zero temperature, which induces non-monotonic behavior in the temperature-dependent magnetization. It is furthermore clarified that a novel magnetic metallic state is stabilized at half filling by the competition between Hund's coupling and the hybridization.