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Raman Scattering in Ferroelectric TlGaSe 2 . Soft Mode and Order Parameter
Author(s) -
Burlakov V. M.,
Yakheev M. R.
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.2221510138
Subject(s) - soft modes , raman scattering , ferroelectricity , raman spectroscopy , phase (matter) , range (aeronautics) , harmonic , materials science , mode (computer interface) , scattering , molecular physics , x ray raman scattering , condensed matter physics , normal mode , optics , physics , atomic physics , vibration , optoelectronics , quantum mechanics , computer science , dielectric , composite material , operating system
The Raman scattering spectra of soft and rigid modes in TlGaSe 2 are investigated over a wide temperature range. The interaction between soft and rigid modes is observed from the description of the experimental spectrum within a model of interacting harmonic oscillators. Temperature dependences of the soft mode frequency and halfwidth are confirmed. The splitting of the rigid Raman mode in the ferroelectric phase is also detected.