Influence of spin-flip scattering on the stability of ferromagnetism in a two-band Hubbard model

TL;DR

This paper studies how spin-flip scattering affects ferromagnetism in a two-band Hubbard model, revealing that it can significantly suppress magnetic order and induce RKKY-like interactions, emphasizing the importance of symmetry considerations.

Contribution

It highlights the crucial role of spin-flip scattering in the stability of ferromagnetism and introduces the impact of interband exchange coupling on magnetic properties.

Findings

Magnetization depends strongly on the exchange coupling J.

Large J suppresses ferromagnetic order.

RKKY-like magnetic ordering mechanism observed.

Abstract

We investigate the influence of an interband exchange interaction on magnetism in a two-band Hubbard model. Our main emphasis lies on spin-flip scattering which is often neglected but is neccessary to retain the full rotational symmetry of the Hamiltonian. We find a striking dependence of the magnetization on the interband exchange coupling constant J and a substantial suppression of ferromagnetic order for a large range of values of J. The onset of an RKKY-like magnetic ordering mechanism is also observed.