Gaussian fluctuations of polarization in the region of phase transitions in DMAGaS-DMAAlS ferroelectrics in the framework of the four-state model
A description of thermodynamics of the DMAGaS-DMAAlS family ferroelectrics improved by taking into account the Gaussian fluctuations of polarization is presented. Fluctuations become important in the vicinity of the second order (or the first order close to the second order) phase transitions which...
Збережено в:
| Дата: | 2004 |
|---|---|
| Автори: | , |
| Формат: | Стаття |
| Мова: | English |
| Опубліковано: |
Інститут фізики конденсованих систем НАН України
2004
|
| Назва видання: | Condensed Matter Physics |
| Онлайн доступ: | http://dspace.nbuv.gov.ua/handle/123456789/118901 |
| Теги: |
Додати тег
Немає тегів, Будьте першим, хто поставить тег для цього запису!
|
| Назва журналу: | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| Цитувати: | Gaussian fluctuations of polarization in the region of phase transitions in DMAGaS-DMAAlS ferroelectrics in the framework of the four-state model / I.V. Stasyuk, O.V. Velychko // Condensed Matter Physics. — 2004. — Т. 7, № 1(37). — С. 141-155. — Бібліогр.: 11 назв. — англ. |
Репозитарії
Digital Library of Periodicals of National Academy of Sciences of Ukraine| id |
irk-123456789-118901 |
|---|---|
| record_format |
dspace |
| spelling |
irk-123456789-1189012017-06-02T03:04:15Z Gaussian fluctuations of polarization in the region of phase transitions in DMAGaS-DMAAlS ferroelectrics in the framework of the four-state model Stasyuk, I.V. Velychko, O.V. A description of thermodynamics of the DMAGaS-DMAAlS family ferroelectrics improved by taking into account the Gaussian fluctuations of polarization is presented. Fluctuations become important in the vicinity of the second order (or the first order close to the second order) phase transitions which is the case of the mentioned crystals. The more elaborated theory, adapting the Onyszkiewicz approach to the purpose of the four-state model, provides equations for components of polarization, their fluctuations and free energy in a simple form with a clear physical sense. The results obtained by numerical calculations demonstrate that in the considered system at the sufficiently long-ranged interaction the Gaussian fluctuations lead to the slight decrease of temperatures of phase transitions from paraphase to ferrophase and in the region of the triple point they are of the same order of magnitude for both first and second order phase transitions. Представлено вдосконалений опис термодинаміки сегнетоелектриків сімейства DMAGaS-DMAAlS, що враховує гаусові флуктуації поляризації. Їх роль зростає в околі фазових переходів другого (або першого, близького до другого) роду, що мають місце в згаданих кристалах. Теорія, побудована шляхом узагальнення наближення Онишкевича для випадку чотиристанової моделі, дає прості за формою і чіткі за фізичним змістом вирази для компонент поляризації, їх флуктуацій та вільної енергії. Отримані числовим способом результати показують, що у досліджуваній системі гаусові флуктуації, приводячи при достатньо далекосяжній взаємодії до незначного пониження температури фазових переходів, в околі потрійної точки є однакового порядку величини при переходах як першого, так і другого роду. 2004 Article Gaussian fluctuations of polarization in the region of phase transitions in DMAGaS-DMAAlS ferroelectrics in the framework of the four-state model / I.V. Stasyuk, O.V. Velychko // Condensed Matter Physics. — 2004. — Т. 7, № 1(37). — С. 141-155. — Бібліогр.: 11 назв. — англ. 1607-324X PACS: 77.84.-s, 64.60.Cn DOI:10.5488/CMP.7.1.141 http://dspace.nbuv.gov.ua/handle/123456789/118901 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 |
A description of thermodynamics of the DMAGaS-DMAAlS family ferroelectrics improved by taking into account the Gaussian fluctuations of polarization is presented. Fluctuations become important in the vicinity of the second order (or the first order close to the second order) phase transitions which is the case of the mentioned crystals. The more elaborated theory, adapting the Onyszkiewicz approach to the purpose of the four-state model, provides equations for components of polarization, their fluctuations and free energy in a simple form with a clear physical sense. The results obtained by numerical calculations demonstrate that in the considered system at the sufficiently long-ranged interaction the Gaussian fluctuations lead to the slight decrease of temperatures of phase transitions from paraphase to ferrophase and in the region of the triple point they are of the same order of magnitude for both first and second order phase transitions. |
| format |
Article |
| author |
Stasyuk, I.V. Velychko, O.V. |
| spellingShingle |
Stasyuk, I.V. Velychko, O.V. Gaussian fluctuations of polarization in the region of phase transitions in DMAGaS-DMAAlS ferroelectrics in the framework of the four-state model Condensed Matter Physics |
| author_facet |
Stasyuk, I.V. Velychko, O.V. |
| author_sort |
Stasyuk, I.V. |
| title |
Gaussian fluctuations of polarization in the region of phase transitions in DMAGaS-DMAAlS ferroelectrics in the framework of the four-state model |
| title_short |
Gaussian fluctuations of polarization in the region of phase transitions in DMAGaS-DMAAlS ferroelectrics in the framework of the four-state model |
| title_full |
Gaussian fluctuations of polarization in the region of phase transitions in DMAGaS-DMAAlS ferroelectrics in the framework of the four-state model |
| title_fullStr |
Gaussian fluctuations of polarization in the region of phase transitions in DMAGaS-DMAAlS ferroelectrics in the framework of the four-state model |
| title_full_unstemmed |
Gaussian fluctuations of polarization in the region of phase transitions in DMAGaS-DMAAlS ferroelectrics in the framework of the four-state model |
| title_sort |
gaussian fluctuations of polarization in the region of phase transitions in dmagas-dmaals ferroelectrics in the framework of the four-state model |
| publisher |
Інститут фізики конденсованих систем НАН України |
| publishDate |
2004 |
| url |
http://dspace.nbuv.gov.ua/handle/123456789/118901 |
| citation_txt |
Gaussian fluctuations of polarization in the region of phase transitions in DMAGaS-DMAAlS ferroelectrics in the framework of the four-state model / I.V. Stasyuk, O.V. Velychko // Condensed Matter Physics. — 2004. — Т. 7, № 1(37). — С. 141-155. — Бібліогр.: 11 назв. — англ. |
| series |
Condensed Matter Physics |
| work_keys_str_mv |
AT stasyukiv gaussianfluctuationsofpolarizationintheregionofphasetransitionsindmagasdmaalsferroelectricsintheframeworkofthefourstatemodel AT velychkoov gaussianfluctuationsofpolarizationintheregionofphasetransitionsindmagasdmaalsferroelectricsintheframeworkofthefourstatemodel |
| first_indexed |
2023-10-18T20:33:16Z |
| last_indexed |
2023-10-18T20:33:16Z |
| _version_ |
1796150504120647680 |