Gigahertz Range Relaxation in Relaxor Ferroelectric Sr0.75Ba0.25Nb2O6
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概要
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The dynamic response of Sr0.75Ba0.25Nb2O6 uniaxial relaxor ferroelectrics is investigated in the GHz–THz range through broadband Brillouin spectroscopy, to clarify the ferroelectric phase transition. The spectra show the temperature and polarization dependent relaxation, which relate to the order–disorder mechanism along the tetragonal $z$-axis. As a result of the polarization fluctuating along the $z$-axis, the acoustic phonons related to the $z$-axis show a marked temperature dependence. The relaxation time is determined in the timescale of $10^{-11}$ s, and its temperature dependence shows an anomaly at approximately 430 K (130 K higher than $T_{\text{C}}$). We show the relaxation to be polar, and interpret the relaxation with the general concept of liquid–glass transitions.
- 2010-09-25
著者
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Kojima Seiji
Graduate School Of Pas Tsukuba Univ.
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Tsukada Shinya
Graduate School Of Pure And Applied Sciences University Of Tsukuba:japan Society For The Promotion Of Science
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Tsukada Shinya
Graduate School of Pure and Applied Sciences, University of Tsukuba, Tsukuba, Ibaraki 305-8573, Japan
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