Influence of ferromagnetic ordering on Raman scattering in CoS$_2$

TL;DR

This paper theoretically investigates how ferromagnetic ordering influences Raman scattering in CoS₂, focusing on phonon interactions and electron transitions to match experimental observations.

Contribution

It introduces a comprehensive theoretical model including phonon-magnon and electron-phonon interactions to explain Raman scattering behavior in ferromagnetic CoS₂.

Findings

Phonon decay into two magnons has low intensity in low Curie temperature ferromagnets.

Electron interband transitions significantly affect Raman spectra.

The model achieves good quantitative agreement with experimental data.

Abstract

The effects of phonon anharmonicity, phonon-magnon and electron-phonon interactions on the temperature dependence of Raman optical phonon modes are theoretically investigated. Besides of the Klemens result for the phonon width due to anharmonicity, the corresponding lineshift is derived. We argue that the phonon decay into two magnons has very low intensity in ferromagnets with low Curie temperatures. Therefore, the electron interband transitions accompanied with the ferromagnetic ordering are included in considerations to get a good quantitative agreement with experiments.