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Description of lattice anharmonicity observed in ferroelectrics with unusual three-well local potential
For Sn₂P₂S₆ family of uniaxial ferroelectrics, the anharmonic quantum oscillators model, based on local threewell potential for spontaneous polarization fluctuations, has been used for a description of anharmonic properties, namely thermal expansion. The calculated pseudospin fluctuations spectra i...
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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/123456789/157076 |
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| Summary: | For Sn₂P₂S₆
family of uniaxial ferroelectrics, the anharmonic quantum oscillators model, based on local threewell potential for spontaneous polarization fluctuations, has been used for a description of anharmonic properties, namely thermal expansion. The calculated pseudospin fluctuations spectra in ferroelectric phase demonstrate negative Grüneisen parameters for excitations that satisfy Curie-Weiss-like temperature and pressure
dependencies in the vicinity of second order phase transition. Thermal expansion coefficient is calculated by
evaluation of pseudospins entropy baric dependence. Negative thermal expansion in the ferroelectric phase of
Sn₂P₂S₆
crystal is obtained which is in agreement with observed experimental data. |
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