Three-mode coupling interference patterns in the dynamic structure factor of a relaxor ferroelectric

Abstract

A long-standing controversy for relaxor ferroelectrics has been the origin of the We find that the PNR mode couples to both optic and acoustic phonons, and that this results in complex patterns in the dynamic structure factor, including intensity pockets and peaks localized in momentum-energy space. These features are fully explained by extending the mode-coupling model to include three coupled damped harmonic oscillators representing the transverse optic, acoustic, and PNR modes.

Correspondence: Reply to ‘Phantom phonon localization in relaxors’

“…2 3 , and Fig. 1 in our more recent work 5 ). Fourth, we modeled possible multiple scattering paths and could not identify a combination of Bragg plus phonon scattering that can fit the experimental results.…”