Open AccessАнтиферродисторсионная мягкая мода в кристалле PbZr-=SUB=-0.024-=/SUB=-Ti-=SUB=-0.976-=/SUB=-O-=SUB=-3-=/SUB=-
Author(s) -
S. B. Vakhrushev,
Ю.А. Бронвальд,
К.А. Петрухно,
С.А. Удовенко,
И.Н. Леонтьев,
A. Bosak
Publication year - 2021
Publication title -
fizika tverdogo tela
Language(s) - English
Resource type - Journals
eISSN - 1726-7498
pISSN - 0367-3294
DOI - 10.21883/ftt.2021.10.51405.113
Subject(s) - brillouin zone , curie temperature , octahedron , condensed matter physics , inelastic neutron scattering , soft modes , materials science , ferroelectricity , curie , inelastic scattering , brillouin scattering , excitation , synchrotron radiation , crystal structure , scattering , crystallography , physics , optics , chemistry , ferromagnetism , dielectric , optoelectronics , quantum mechanics , optical fiber
The antiferrodistortive soft mode was detected at the M point of the Brillouin zone in a crystal PbZr0.024Ti0.976O3 using the method of inelastic scattering of synchrotron radiation. The performed group-theoretical analysis and calculations of inelastic structural factors made it possible to relate the detected critical excitation to oxygen octahedra rotations. The traced temperature evolution of the soft mode frequency obeys the Curie-Weiss law with Curie temperature T AFD = 438 ± 5 K, which is close to the ferroelectric Curie temperature T FE = 479.5 K.