Anomalous Behavior of Acoustic Phonon Velocity and Damping in Uniaxial Ferroelectric Tscc
Anomalous Behavior of Acoustic Phonon Velocity and Damping in Uniaxial Ferroelectric Tscc
复制标题
单轴铁电 Tscc 中声子速度和阻尼的反常行为
DOI：
10.1080/00150198508012775
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发表时间：
1985
期刊：
影响因子：
0.8
通讯作者：
W. Windsch
中科院分区：
文献类型：
--
作者：
G. Smolensky;I. Siny;A. Tagantsev;S. A. Prokhorova;W. Windsch
研究了单轴TSCC中包括铁电相变在内的宽温区声子行为。结果表明，由于软光模的弱极性，在序参数动力学中观察到了从偶极子到伊辛区的交叉。这种交叉既表现在声学声子沿极轴传播的速度和衰减上，也表现在涨落修正的特殊温度行为上。发展了弱极性单轴铁电材料的唯象理论，并在此基础上解释了TSCC的反常性质。
The study of acoustic phonon behavior in a wide temperature interval including the ferroelectric phase transition in uniaxial TSCC was performed. It is shown that due to the weak polarity of the soft optic mode a crossover in the order parameter dynamics from dipole to Ising regime is observed. This crossover manifests itself both in the velocity and damping of acoustic phonons, propagating along polar axis, and in the specific temperature behavior of fluctuation corrections. Phenomenological theory for a weak polar uniaxial ferroelectric is developed, on the basis of which interpretation of unusual properties of TSCC is given.