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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...
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| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
Інститут фізики конденсованих систем НАН України
2018
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| Series: | Condensed Matter Physics |
| Online Access: | http://dspace.nbuv.gov.ua/handle/123456789/157049 |
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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. |
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