Carrier doping to a partially disordered state in the periodic Anderson model on a triangular lattice

TL;DR

This study explores how doping affects a partially disordered insulating state in the periodic Anderson model on a triangular lattice, revealing its destabilization and phase separation into metallic states with different magnetic orders.

Contribution

It demonstrates the impact of carrier doping on the stability of a partially disordered state in the periodic Anderson model using Hartree-Fock approximation.

Findings

Doping destabilizes the partially disordered insulating state.

Doped carriers lead to phase separation into metallic states.

Partially disordered state exists only at half-filling.

Abstract

We investigate the effect of hole and electron doping to half-filling in the periodic Anderson model on a triangular lattice by the Hartree-Fock approximation at zero temperature. At half-filling, the system exhibits a partially disordered insulating state, in which a collinear antiferromagnetic order on an unfrustrated honeycomb subnetwork coexists with nonmagnetic state at the remaining sites. We find that the carrier doping destabilizes the partially disordered state, resulting in a phase separation to a doped metallic state with different magnetic order. The partially disordered state is restricted to the half-filled insulating case, while its metallic counterpart is obtained as a metastable state in a narrow electron doped region.