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Isotope effect on the soft-mode dynamics of SrTiO3 studied by Raman scattering

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タイトル: Isotope effect on the soft-mode dynamics of SrTiO3 studied by Raman scattering
著者: Taniguchi, H. 著作を一覧する
Yagi, T. 著作を一覧する
Takesada, M. 著作を一覧する
Itoh, M. 著作を一覧する
キーワード: Dielectric, piezoelectric, and ferroelectric niobates, titanates, tantalates, PZT ceramics, etc
Ferroelectric phase transitions and Curie point
Infrared and Raman spectra (condensed matter)
発行日: 2005年 8月18日
出版者: American Physical Society
誌名: Physical Review. B
巻: 72
号: 6
開始ページ: 064111
出版社 DOI: 10.1103/PhysRevB.72.064111
抄録: he oxygen isotope effect on the soft-mode dynamics in quantum paraelectric SrTi(18O<sub>x</sub><sup>16</sup>O1-x)3 [STO18-x] is investigated by Raman scattering in terms of local symmetry breaking in the paraelectric phase. The exchange rates x of the 18O atoms are 0.23 [STO18-23] and 0.32 [STO18-32], which are less than the critical value xc(=0.33). In STO18-32, whose exchange rate is just below xc, the soft Eu mode shows hardening behavior in a low-temperature region indicating the onset of local ferroelectric order. On the other hand, the soft Eu mode in STO18-23 does not show any hardening behavior until 0 K. The enhancement of the inhomogeneity in the crystal by the exchange of 18O is concluded to play an essential role in the soft-mode dynamics of the quantum paraelectric and ferroelectric STO18-x. The relation between the soft-mode dynamics and quantum fluctuation is discussed.
Rights: Copyright © 2005 The American Physical Society
資料タイプ: article
URI: http://hdl.handle.net/2115/14402
出現コレクション:雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

提供者: 八木 駿郎

 

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