Incommensurate magnetic order in rare earth and transition metal compounds with local moments

TL;DR

This paper investigates various magnetic orders, including incommensurate states, in systems with local moments using a mean-field exchange model across different lattice types, revealing complex phase behaviors.

Contribution

It introduces a comprehensive mean-field analysis of magnetic phases, including inhomogeneous states, in lattice systems with local moments, expanding understanding of magnetic phase transitions.

Findings

Rich variety of magnetic structures identified

Inhomogeneous states and phase separation analyzed

Dependence of magnetic order saturation on model parameters

Abstract

Within the framework of the $s$-$d(f)$ exchange model in the mean-field approximation for square, simple cubic, body-centered and face-centered cubic lattices, the formation of a ferromagnetic, spiral, and commensurate antiferromagnetic order is investigated. The possibility of the formation of inhomogeneous states (magnetic phase separation), which necessarily arises during first-order phase transitions in the electron filling parameter, is taken into account. The saturation of the antiferromagnetic and spiral states is studied depending on the parameters of the model. The results obtained include a rich variety of magnetic structures and phase transitions, allowing the interpretation of magnetic properties of semiconducting and metallic systems containing magnetic atoms.