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

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Title: Isotope effect on the soft-mode dynamics of SrTiO3 studied by Raman scattering
Authors: Taniguchi, H. Browse this author
Yagi, T. Browse this author
Takesada, M. Browse this author →KAKEN DB
Itoh, M. Browse this author
Keywords: Dielectric, piezoelectric, and ferroelectric niobates, titanates, tantalates, PZT ceramics, etc
Ferroelectric phase transitions and Curie point
Infrared and Raman spectra (condensed matter)
Issue Date: 18-Aug-2005
Publisher: American Physical Society
Journal Title: Physical Review. B
Volume: 72
Issue: 6
Start Page: 064111
Publisher DOI: 10.1103/PhysRevB.72.064111
Abstract: 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
Type: article
URI: http://hdl.handle.net/2115/14402
Appears in Collections:電子科学研究所 (Research Institute for Electronic Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 八木 駿郎

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