The 90° Domain Boundary Drag by Acoustic Phonons in Ferroelectrics

Abstract

The evaluation of the phonon viscosity coefficient caused by interaction between 0 a mobile 90 domain boundary in a ferroelectric of the perovskite type (structure) and acoustic phonons when the width of the domain boundary exceeds their wavelengths i s the subject of the present paper. The study refers to sufficiently high temperatures T 2 2 Z E fi/4 k 6 at which the basic contribution to the viscosity coefficient is due to the short-wave phonons and this makes it possible to apply the JWKB method assuming that the change of elastic moduli in the domain boundary