Ferroelectric Phase Transition and Photoinduced Cooperative Phenomena in Bi-Layered Perovskite Pb2Bi4Ti5O18 Ceramics Studied by Brillouin Scattering
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概要
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The ferroelectric phase transition mechanism and ultraviolet (UV) photoexcition effect have been investigated in the bismuth layered perovskite Pb2Bi4Ti5O18 by Brillouin scattering using a Sandercock-type tandem Fabry–Perot interferometer. The temperature dependences of Brillouin spectra both with and without UV irradiation were observed around phase transition points. The observed Brillouin spectra include a central peak component that shows an anomaly in the ferroelectric phase transition point $T_{\text{C}}=450$ K. The central peak spectra show narrowing under UV irradiation. The correlation length of the ferroelectric dipole fluctuation should be enhanced with the UV irradiation effect below $T_{\text{C}}$.
- 2010-09-25
著者
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Miyayama Masaru
Research Center For Advanced Science And Technology (rcast) The University Of Tokyo
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Onodera Akira
Department Of Molecular Life Science Tokai University School Of Medicine
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Takesada Masaki
Department Of Physics Faculty Of Science Yamaguchi University
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Noguchi Yuji
Research Center For Advanced Science And Technology The University Of Tokyo
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Onodera Akira
Department of Physics, Faculty of Science, Hokkaido University, Sapporo 060-0810, Japan
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Ueki Ayaka
Department of Physics, Faculty of Science, Hokkaido University, Sapporo 060-0810, Japan
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