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Soft Mode in Heteroepitaxial (Ba, Sr)TiO 3 MgO Thin Films
Author(s) -
Yuzyuk Yu.I.,
Almeida A.,
Chaves M.R.,
Alyoshin V.A.,
Zakharchenko I.N.,
Sviridov E.V.
Publication year - 2000
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/1521-3951(200011)222:2<535::aid-pssb535>3.0.co;2-p
Subject(s) - raman spectroscopy , soft modes , raman scattering , ferroelectricity , materials science , thin film , condensed matter physics , solid solution , optics , crystallography , nanotechnology , optoelectronics , chemistry , physics , metallurgy , dielectric
Polarized Raman spectra of tetragonally distorted (Ba 1— x Sr x )TiO 3 /MgO ferroelectric films were obtained in special scattering geometries using a micro‐Raman set‐up. The underdamped E(TO) soft mode was unambiguously observed in the films with x = 0.30 and 0.45. The low‐temperature behaviour of the E(TO) soft mode for x = 0.45 was found substantially different from those observed in pure crystals and bulk solid solutions.