Broadband Brillouin scattering study of ferroelectric instability of barium sodium niobate
| Title: | Broadband Brillouin scattering study of ferroelectric instability of barium sodium niobate |
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| Authors: | S. Kojima |
| Source: | Condensed Matter Physics, Vol 25, Iss 4, p 43702 (2022) |
| Publisher Information: | Institute for Condensed Matter Physics, 2022. |
| Publication Year: | 2022 |
| Collection: | LCC:Physics |
| Subject Terms: | brillouin scattering, ferroelectric, order-disorder, central peak, barium sodium niobate, Physics, QC1-999 |
| More Details: | The barium sodium niobate (BNN) with tungsten-bronze structure is one of well-known optical crystals for electro-optic and nonlinear optic applications. This paper reviews the ferroelectric instability of BNN crystals. BNN is a uniaxial ferroelectric with a spontaneous polarization along the tetragonal c-axis. There is no report on the observation of an optical soft mode responsible for a ferroelectric phase transition. In the vicinity of the Curie temperature, T_C = 560°C, an intense central peak (CP) related to the polarization fluctuations along the c-axis was observed by the broadband Brillouin scattering experiment. The relaxation time determined by the CP width shows the critical slowing down towards T_C. This fact indicates that the ferroelectric instability of BNN is an order-disorder type. |
| Document Type: | article |
| File Description: | electronic resource |
| Language: | English |
| ISSN: | 1607-324X 2224-9079 |
| Relation: | https://doaj.org/toc/1607-324X; https://doaj.org/toc/2224-9079 |
| DOI: | 10.5488/CMP.25.43702 |
| Access URL: | https://doaj.org/article/3a33fc401ca04ec2b94f20d44203edc7 |
| Accession Number: | edsdoj.3a33fc401ca04ec2b94f20d44203edc7 |
| Database: | Directory of Open Access Journals |
| ISSN: | 1607324X 22249079 |
|---|---|
| DOI: | 10.5488/CMP.25.43702 |
| Published in: | Condensed Matter Physics |
| Language: | English |