Ferroelectricity

Diffuse scattering analysis in the vicinity of the M-point in perovskites for the case of intermode interaction

S. B. Vakhrushev, K. A. Petroukhno

Ioffe Institute, St. Petersburg, Russia

Abstract: A generalization of the interacting modes model is proposed for the case of diffuse scattering (DS). The study confirms the applicability of the previously established coupled-mode model for the analysis of DS in PbZr$_{0.976}$Ti$_{0.024}$O$_3$ (PZT2.4). The model, previously used to describe inelastic scattering at individual points, can now be applied to continuously describe the change in DS intensity along an arbitrary direction in reciprocal space. The developed approach of phonon decomposition of DS in the presence of mode coupling significantly expands the opportunities of studying the critical dynamics of perovskites.

Keywords: ferroelectrics, antiferroelectrics, phase transitions, lattice dynamics, critical scattering, diffuse scattering.

Received: 10.07.2024
Revised: 25.07.2024
Accepted: 26.07.2024

DOI: 10.61011/FTT.2024.09.58781.185