Scaling relation of spin wave lifetime in double-exchange systems

TL;DR

This paper investigates the spin wave lifetime scaling in double-exchange systems through theoretical and experimental methods, aligning neutron scattering results with a proposed electronic model, and discusses additional interactions like polaron effects.

Contribution

It introduces a scaling relation for spin wave lifetime in double-exchange systems, supported by both theory and neutron scattering experiments, and discusses the influence of other interactions.

Findings

Scaling relation for spin wave lifetime observed

Experimental results consistent with theoretical model

Discussion of polaron effects and other interactions

Abstract

Spin excitation spectrum of CMR manganites are studied from both theoretical and experimental sides. Scaling relations for the spin wave lifetime in the electronic model with double-exchange interaction is observed, which is consistent with results for neutron inelastic scattering experiments for (La,Y)$_{0.8}$Sr$_{0.2}$MnO$_3$. Roles of other interactions and degrees of freedom such as polaron effects are also discussed.