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Raman Spectroscopy of Soft and Rigid Modes in Ferroelectric TlInS 2
Author(s) -
Burlakov V. M.,
Ryabov A. P.,
Yakheev M. P.,
Vinogradov E. A.,
Melnik N. N.,
Gasanly N. M.
Publication year - 1989
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/pssb.2221530232
Subject(s) - soft modes , ferroelectricity , raman spectroscopy , condensed matter physics , phase transition , lattice (music) , materials science , phase (matter) , spectroscopy , optics , molecular physics , physics , optoelectronics , quantum mechanics , acoustics , dielectric
Low‐frequency Raman spectra of a TlInS 2 single crystal in the vicinity of a ferroelectric phase transition are reported. In the ferroelectric phase a soft mode interacting with some rigid modes is observed. The temperature dependence of the soft mode frequency is found to be proportional to ( T c – T ) 1/2 . An unusual behaviour of the rigid mode (ω = 20 cm −1 ) is observed. This fact is interpreted in terms of inherent lattice defects which cause nonhomogeneous broadening.