Nonlinear dynamics of ferroelectrics with three-well local potential

For Sn2P2S6 ferroelectrics, the appearance of spontaneous polarization is related to stereoactivity of tin cations and valence fluctuations of phosphorous cations. Here, the continuous phase transition and its behavior under pressure is determined by thee-well local potential and can be described in...

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Bibliographic Details
Published in:Condensed matter physics 2018-01, Vol.21 (2), p.23001
Main Authors: Yevych, Medulych, Vysochanskii
Format: Article
Language:English
Subjects:
Anharmonicity
Cations
Ferroelectric materials
Ferroelectricity
Ferroelectrics
Lattice instability
lattice models in statistical physics
Lattice vibration
Nonlinear dynamics
phase diagrams
Phase transitions
Raman spectroscopy
Variations
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Summary:For Sn2P2S6 ferroelectrics, the appearance of spontaneous polarization is related to stereoactivity of tin cations and valence fluctuations of phosphorous cations. Here, the continuous phase transition and its behavior under pressure is determined by thee-well local potential and can be described in an anharmonic quantum oscillator model. For such a model, the spectrum of pseudospin fluctuations at different temperatures and pressures has been calculated and compared with the data of Raman spectroscopy. It was revealed that the ferroelectric lattice instability is related to several low energy optic modes.
ISSN:1607-324X
2224-9079
DOI:10.5488/CMP.21.23001