Quantum paraelectricity versus ferroelectricity: Nonlinear polarizability model
Quantum paraelectricity versus ferroelectricity: Nonlinear polarizability model
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量子顺电性与铁电性：非线性极化模型
DOI：
10.1103/physrevb.70.024104
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发表时间：
2004
影响因子：
3.7
通讯作者：
A. Bishop
中科院分区：
文献类型：
--
作者：
A. Bussmann;A. Bishop
在非线性极化率模型下研究了量子涨落对铁电性的抑制。发现了量子涨落主导态的质量依赖性，与已知的量子顺电体相比，它可以扩展到相当高的温度。此外，当铁电性被抑制时，观察到从有序-无序到位移动力学的交叉。一个阶段出现在一个制度，其中偏离高温行为设置，其中极性前体与顺电量子涨落共存。弹性刚度被发现至关重要的模式模式耦合和系统的稳定性。
The suppression of ferroelectricity by quantum fluctuations is investigated within a nonlinear polarizability model. A mass dependence of the quantum fluctuation dominated state is discovered which can extend to rather high temperatures as compared to known quantum paraelectrics. In addition a crossover from order-disorder to displacive dynamics is observed when ferroelectricity is suppressed. A phase appears in a regime where deviations from the high-temperature behavior set in, where polar precursors coexist with paraelectric quantum fluctuations. Elastic stiffness is found to crucially contribute to mode-mode coupling and the stability of the system.