Precursor effects, broken local symmetry, and coexistence of order-disorder and displacive dynamics in perovskite ferroelectrics

A. Bussmann-Holder; H. Beige; G. Voelkel

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Precursor effects, broken local symmetry, and coexistence of order-disorder and displacive dynamics in perovskite ferroelectrics

机译：钙钛矿铁电体中的前驱效应，局部对称破坏以及有序无序和置换动力学的共存

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The dynamical properties of ferroelectric perovskites have typically been classified as being either of order-disorder or displacive type. Here we show that this simple scheme is not generally applicable but that the generic and intrinsic properties of this material class always combine both aspects. Important in this respect is the fact that different length and time scales are associated with the two properties which makes it difficult to observe them with a single experiment. In addition, it is shown that independent of the transition temperature of the respective system precursor dynamics exist which set in approximately 75 K above the actual phase-transition temperature. This theoretical result is supported by measurements of elastic and dielectric coefficients.

机译：铁电钙钛矿的动力学性质通常被分类为有序或无序类型。在这里，我们证明了这种简单的方案通常不适用，但是这种材料类别的通用和固有属性始终将这两个方面结合在一起。在这方面，重要的是以下事实：两个属性具有不同的长度和时标，这使得很难通过单个实验来观察它们。此外，还表明，独立于各个系统前体动力学的转变温度存在，其设置在实际相变温度之上约75K。弹性系数和介电系数的测量结果支持了这一理论结果。

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来源
《Physical review》 |2009年第18期|184111.1-184111.6|共6页
作者
A. Bussmann-Holder; H. Beige; G. Voelkel;
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作者单位

Max-Planck-Institut fuer Festkoerperforschung, Heisenberg str. I. D-70569 Stuttgart, Germany;

Naturwissenschaftliche Fakultaet II, Institut fuer Phvsik-Phvsik Fermischer Muterialien, Martin-Luther-Vniversitaet Halle-Wittenberg, Fnedemann-Bach-P/atz 6, D-0610S Halle/Saale, Germany;

Fakultaet fuer Physik und Geowissenschaften der Universitaet Leipzig. Linnestr. 5, D-04103 Leipzig, Germany;

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正文语种 eng
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dielectric; piezoelectric; ferroelectric; and antiferroelectric materials; phase transitions and curie point; anharmonic lattice modes;

机译：电介质压电铁电反铁电材料;相变和居里点;非调和晶格模;

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Precursor effects, broken local symmetry, and coexistence of order-disorder and displacive dynamics in perovskite ferroelectrics

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