Orientational Field-Induced Effects in Brillouin Spectra of Lead Magnesium Niobate Crystals
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概要
- 論文の詳細を見る
The Brillouin light scattering studies of hypersonic acoustic phonons as a function of applied electric field in relaxor ferroelectric PbMg1/3Nb2/3O3-PMN in the temperature range 100–300 K are reported. The orientational dependence of the electroacoustic effect has been studied. It has been shown that the dependence of the velocity of quasilongitudinal hypersonic phonons (QLA) on dc applied electric field direction manifests itself below $T_{\text{crit}}\approx 235$ K. Field-induced changes in the Brillouin scattering spectra of the PbMg1/3Nb2/3O3 (PMN) relaxor ferroelectric have been examined in the vicinity of a diffuse phase transition under a dc electric field oriented along the [111] direction. It has been established that the transition into an electric-field-induced ferroelectric phase is accompanied by anomalies in the behavior of the QLA phonon propagating along the [110] direction at $T_{\text{B}}\approx 160$ K. The changes in QLA velocity at the ferroelectric phase transition were found to be either reversible or irreversible in different regions of the induced ferroelectric phase. The experimental results are compared with $E$–$T$ phase diagrams.
- Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
- 2005-09-15
著者
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Lushnikov Sergey
A. F. Ioffe Physical Technical Institute
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Ko Jae
Department Of Advanced Technology Fusion Konkuk University
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Kojima Seiji
Institute For Solid State Physics University Of Tokyo
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Ko Jae
Department of Physics, Hallym University, 39 Hallymdaehak-gil, Chancheon, Gangwon-do 20-702, Korea
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Fedoseev Alexander
A. F. Ioffe Physical Technical Institute, 194021 St. Petersburg, Russia
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Lushnikov Sergey
A. F. Ioffe Physical Technical Institute, 194021 St. Petersburg, Russia
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