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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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Title: Perfect Softening of the Ferroelectric Mode in the Isotope-Exchanged Strontium Titanate of SrTi^18O3 Studied by Light Scattering
Authors: Takesada, M.1 Browse this author →KAKEN DB
Itoh, M. Browse this author
Yagi, T.3 Browse this author →KAKEN DB
Authors(alt): 武貞, 正樹1
八木, 駿郎3
Keywords: Dielectric, piezoelectric, and ferroelectric niobates, titanates, tantalates, PZT ceramics, etc
Phonons in crystal lattices
Infrared and Raman spectra (condensed matter)
Issue Date: 9-Jun-2006
Publisher: American Physical Society
Journal Title: Physical Review Letters
Volume: 96
Issue: 22
Start Page: 227602
Publisher DOI: 10.1103/PhysRevLett.96.227602
PMID: 16803345
Abstract: 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
Relation: http://prl.aps.org/
Type: article
URI: http://hdl.handle.net/2115/14401
Appears in Collections:理学院・理学研究院 (Graduate School of Science / Faculty of Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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・武貞 正樹

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