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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| Дата: | 2018 |
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| Автори: | , |
| Формат: | Стаття |
| Мова: | English |
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Інститут фізики конденсованих систем НАН України
2018
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| Назва видання: | Condensed Matter Physics |
| Онлайн доступ: | http://dspace.nbuv.gov.ua/handle/123456789/157076 |
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| Назва журналу: | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| Цитувати: | Description of lattice anharmonicity observed in ferroelectrics with unusual three-well local potential / R. Yevych, Yu. Vysochanskii // Condensed Matter Physics. — 2018. — Т. 21, № 3. — С. 33001: 1–6. — Бібліогр.: 19 назв. — англ. |
Репозитарії
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irk-123456789-1570762019-06-20T01:29:07Z Description of lattice anharmonicity observed in ferroelectrics with unusual three-well local potential Yevych, R. Vysochanskii, Yu. 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. Для одновiсних сегнетоелектрикiв сiмейства Sn₂P₂S₆ модель квантових ангармонiчних осциляторiв, що базується на локальному триямному потенцiалi для флуктуацiй спонтанної поляризацiї, застосована для опису ангармонiчних властивостей, а саме, теплового розширення. Розрахований спектр флуктуацiй псевдоспiнiв в сегнетоелектричнiй фазi демонструє вiд’ємнi параметри Грюнайзена для збуджень, чиї температурнi та баричнi залежностi в околi фазового переходу мають поведiнку типу Кюрi-Вейса. Коефiцiєнт теплового розширення розрахований за допомогою баричної залежностi ентропiї системи. Отримане вiд’ємне теплове розширення в сегнетоелектричнiй фазi кристалу Sn₂P₂S₆ , яке добре узгоджується зi спостережуваними експериментальними даними. 2018 Article Description of lattice anharmonicity observed in ferroelectrics with unusual three-well local potential / R. Yevych, Yu. Vysochanskii // Condensed Matter Physics. — 2018. — Т. 21, № 3. — С. 33001: 1–6. — Бібліогр.: 19 назв. — англ. 1607-324X PACS: 05.50.+q, 05.70.Fh, 63.70.+h, 77.84.-s, 65.60.+a DOI:10.5488/CMP.21.33001 arXiv:1809.09463 http://dspace.nbuv.gov.ua/handle/123456789/157076 en Condensed Matter Physics Інститут фізики конденсованих систем НАН України |
| institution |
Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| collection |
DSpace DC |
| language |
English |
| description |
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. |
| format |
Article |
| author |
Yevych, R. Vysochanskii, Yu. |
| spellingShingle |
Yevych, R. Vysochanskii, Yu. Description of lattice anharmonicity observed in ferroelectrics with unusual three-well local potential Condensed Matter Physics |
| author_facet |
Yevych, R. Vysochanskii, Yu. |
| author_sort |
Yevych, R. |
| title |
Description of lattice anharmonicity observed in ferroelectrics with unusual three-well local potential |
| title_short |
Description of lattice anharmonicity observed in ferroelectrics with unusual three-well local potential |
| title_full |
Description of lattice anharmonicity observed in ferroelectrics with unusual three-well local potential |
| title_fullStr |
Description of lattice anharmonicity observed in ferroelectrics with unusual three-well local potential |
| title_full_unstemmed |
Description of lattice anharmonicity observed in ferroelectrics with unusual three-well local potential |
| title_sort |
description of lattice anharmonicity observed in ferroelectrics with unusual three-well local potential |
| publisher |
Інститут фізики конденсованих систем НАН України |
| publishDate |
2018 |
| url |
http://dspace.nbuv.gov.ua/handle/123456789/157076 |
| citation_txt |
Description of lattice anharmonicity observed in ferroelectrics with unusual three-well local potential / R. Yevych, Yu. Vysochanskii // Condensed Matter Physics. — 2018. — Т. 21, № 3. — С. 33001: 1–6. — Бібліогр.: 19 назв. — англ. |
| series |
Condensed Matter Physics |
| work_keys_str_mv |
AT yevychr descriptionoflatticeanharmonicityobservedinferroelectricswithunusualthreewelllocalpotential AT vysochanskiiyu descriptionoflatticeanharmonicityobservedinferroelectricswithunusualthreewelllocalpotential |
| first_indexed |
2023-05-20T17:51:29Z |
| last_indexed |
2023-05-20T17:51:29Z |
| _version_ |
1796154253878755328 |