Carrier-induced ferromagnetism in a diluted Hubbard model

TL;DR

This paper explores how carriers induce ferromagnetism in a diluted Hubbard model with ordered impurities, revealing complex behaviors and matching experimental transition temperatures in GaMnN.

Contribution

It introduces a detailed analysis of carrier-induced ferromagnetism in a diluted Hubbard model with ordered impurities, highlighting the competition of spin interactions and matching experimental data.

Findings

Rich variety of behaviors due to particle-hole process competition

Ferromagnetic transition temperature aligns with experimental values for GaMnN

Demonstrates the importance of impurity arrangement in magnetic properties

Abstract

Carrier-induced ferromagnetism is investigated in a diluted Hubbard model for ordered impurity arrangements. The delicate competition between particle-hole processes contributing to the spin couplings results in a rich variety of behaviour. The ferromagnetic transition temperature obtained within the spin-fluctuation theory is in good agreement with reported values for $\rm Ga_{1-x} Mn_x N$.