Self-consistent Analysis of Doping Effect for Magnetic Ordering in Stacked-Kagome Weyl System

TL;DR

This paper investigates how carrier doping influences magnetic ordering in a stacked-kagome Weyl system, revealing doping-dependent magnetic phases and associated electronic properties using theoretical modeling.

Contribution

It provides a self-consistent analysis of doping effects on magnetism in Co3Sn2S2, highlighting the emergence of non-collinear antiferromagnetism and related phenomena.

Findings

Hole doping suppresses ferromagnetic order.

Undoped Co3Sn2S2 exhibits magnetic Weyl semimetal state.

Electron doping induces non-collinear antiferromagnetic order.

Abstract

We theoretically study the carrier doping effect for magnetism in a stacked-kagome system $\rm{{Co}_3{Sn}_2{S}_2}$ based on an effective model and the Hartree-Fock method. We show the electron filling and temperature dependences of the magnetic order parameter. The perpendicular ferromagnetic ordering is suppressed by hole doping, wheres undoped $\rm{{Co}_3{Sn}_2{S}_2}$ shows magnetic Weyl semimetal state. Additionally, in the electron-doped regime, we find a non-collinear antiferromagnetic ordering. Especially, in the non-collinear antiferromagnetic state, by considering a certain spin-orbit coupling, the finite orbital magnetization and the anomalous Hall conductivity are obtained.