Magnon Broadening Effect by Magnon-Phonon Interaction in Colossal Magnetoresistance Manganites

TL;DR

This paper investigates how magnon-phonon interactions cause magnon broadening in colossal magnetoresistance manganites, revealing that magnon linewidth broadening occurs when magnon and phonon branches cross, explaining anomalous damping.

Contribution

It demonstrates the relationship between magnon-phonon interactions and magnon broadening, providing insights into magnetic excitation behaviors in manganites.

Findings

Magnon linewidth broadening occurs at magnon-phonon branch crossings.

Onset of broadening correlates with magnon density of states.

Explains anomalous magnon damping at Brillouin zone boundary.

Abstract

In order to study the magnetic excitation behaviors in colossal magnetoresistance manganites, a magnon-phonon interacting system is investigated. Sudden broadening of magnon linewidth is obtained when a magnon branch crosses over an optical phonon branch. Onset of the broadening is approximately determined by the magnon density of states. Anomalous magnon damping at the brillouine zone boundary observed in low Curie temperature manganites is explained.