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Perfect Softening of the Ferroelectric Mode in the Isotope-Exchanged Strontium Titanate of SrTi^18O3 Studied by Light Scattering

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タイトル: Perfect Softening of the Ferroelectric Mode in the Isotope-Exchanged Strontium Titanate of SrTi^18O3 Studied by Light Scattering
著者: Takesada, M. 著作を一覧する
Itoh, M. 著作を一覧する
Yagi, T. 著作を一覧する
キーワード: Dielectric, piezoelectric, and ferroelectric niobates, titanates, tantalates, PZT ceramics, etc
Phonons in crystal lattices
Infrared and Raman spectra (condensed matter)
発行日: 2006年 6月 9日
出版者: American Physical Society
誌名: Physical Review Letters
巻: 96
開始ページ: 227602
出版社 DOI: 10.1103/PhysRevLett.96.227602
抄録: The Eu mode of the isotope-induced ferroelectric strontium titanate SrTi^18O3 shows a perfect softening at the ferroelectric phase transition temperature Tc, where the frequency of the underdamped mode approaches completely to zero within the instrumental resolution. The spectra of the Raman inactive soft Eu mode have been successfully observed owing to local symmetry breaking and by long-term accumulation of the spectral intensity with a high resolution technique. The mechanism of the phase transition is concluded to be an ideal displacive-type accompanied with perfect softening of the Slater-type polar Eu mode. The difference between the soft mode behavior of SrTi^16O3 and SrTi^18O3 indicates that the origin of the quantum paraelectric state of SrTi^16O3 lies in the quantum fluctuation of the oxide octahedron in the perovskite structure.
Rights: Copyright © 2006 The American Physical Society
資料タイプ: article
URI: http://hdl.handle.net/2115/14401
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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