The Nature of Vibrations of a 2-D Disordered Lattice Model with Nano-scale Order

TL;DR

This study investigates vibrational excitations in a disordered 2D lattice with nano-scale chemical order, revealing mode crossover phenomena and mode mixing effects relevant to relaxor ferroelectrics.

Contribution

It provides a numerical analysis of vibrational modes in a disordered lattice with nano-scale order, highlighting mode crossover and mixing mechanisms.

Findings

Ioffe-Regel crossover in acoustic modes

Localized high-frequency vibrational modes

Increased mode uncertainty with smaller nano-regions

Abstract

Motivated by the unusual soft mode anomalies in the relaxor ferroelectrics, we present a numerical study of vibrational excitations of a disordered lattice model with chemical order on the nano-scale. We find an Ioffe-Regel crossover in acoustic modes separating propagating low-frequency modes from the intermediate frequency diffusons, and localized modes at the high-frequency end of the spectrum. At a fixed degree of disorder, we find increasing uncertainty in the momentum of long wave-length optical modes with decrease in the size of nano-ordered regions. We determine the cause for this to be a strong mixing between acoustic and optical modes, believed to be central to the model of waterfall phonon anomalies.