| Автор | Yakov Girshberg |
| Автор | Yizhak Yacoby |
| Дата выпуска | 1999-12-06 |
| dc.description | We present a microscopic theory of ferroelectric phase transitions and off-centre displacements in perovskites. We show that the inclusion of strong intraband electron-phonon interaction (i.e. the existence of small polarons) into the framework of the interband theory of displacive-like ferroelectrics leads to local spin-like structural distortions in the paraelectric phase. Their interaction with the soft mode induces spin-spin coupling through the soft phonon leading to a spin-ordering phase transition. The resulting theory is shown to quantitatively explain both displacive-like and order-disorder-like features of two representative perovskites: KNbO<sub>3</sub> and PbTiO<sub>3</sub>. |
| Формат | application.pdf |
| Издатель | Institute of Physics Publishing |
| Название | Ferroelectric phase transitions and off-centre displacements in systems with strong electron-phonon interaction |
| Тип | paper |
| DOI | 10.1088/0953-8984/11/48/337 |
| Electronic ISSN | 1361-648X |
| Print ISSN | 0953-8984 |
| Журнал | Journal of Physics: Condensed Matter |
| Том | 11 |
| Первая страница | 9807 |
| Последняя страница | 9822 |
| Аффилиация | Yakov Girshberg; Racah Institute of Physics, Hebrew University, Jerusalem 91904, Israel |
| Аффилиация | Yizhak Yacoby; Racah Institute of Physics, Hebrew University, Jerusalem 91904, Israel |
| Выпуск | 48 |
