Phonon-Magnon coupling in CoF$_2$ investigated by time-of-flight neutron spectroscopy

TL;DR

This study uses time-of-flight neutron spectroscopy to investigate phonon-magnon coupling in CoF₂, revealing strong magnetoelastic effects and coupling across multiple branches, advancing understanding of magnetic and lattice interactions.

Contribution

It provides detailed experimental evidence of phonon-magnon coupling in CoF₂ using neutron scattering, highlighting the strong magnetoelastic effects in this antiferromagnet.

Findings

Magnon-phonon coupling observed across all branches.

Strong magnetoelastic effects confirmed.

Temperature and Q dependence support coupling presence.

Abstract

We report the results of inelastic neutron scattering investigation on the model antiferromagnet CoF$_2$ by time-of-flight neutron spectroscopy. We measured the details of the scattering function $S(Q,\omega)$ as a function of temperature with two different incident neutron wavelengths. The temperature and Q dependence of the measured scattering function suggests the presence of magnon-phonon coupling in almost all branches. The present results are in agreement with the strong magnetoelastic effects observed previously.