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首页> 外文期刊>The European physical journal, B. Condensed matter physics >The Rhodes-Wohlfarth parameter as assessment of the displacive degree in ferroelectrics: The case of the #PHI#~4 model
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The Rhodes-Wohlfarth parameter as assessment of the displacive degree in ferroelectrics: The case of the #PHI#~4 model

机译：用Rhodes-Wohlfarth参数评估铁电体的位移程度：＃PHI＃〜4模型的情况

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摘要

The Rhodes-Wohlfarth parameter extended to ferroelectrics by Tokunaga [J. Phys. Soc. Jap. 57, 4275 (1988)] is here analyzed within the #PHI#~4 model. It is shown that it can be directly related with the displacive degree of the transition as described by the ratio C/E_0, between the non-local coupling, C, driving the transition and the depth of the energy well, E_0, associated with the distorted structure. However, the Rhodes-Wohlfarth parameter becomes asympototically constant as C/E_0 decreases, i.e. for systems closer to the order disorder limit. Under this viewpoint, the very limited range of values observed for this experimental parameter is explained and is shown that, in general, it can only assess quantitatively for character of the transition in rather displacive cases. The argument can be generalized to more complex systems, and when applied to well known materials, a rough estimation of the displacive degree and the relevant microscopic energetic parameters in rather displacive ferroelectrics is possible.
机译：Rhodes-Wohlfarth参数由Tokunaga扩展到铁电体[J.物理Soc。日本57，4275（1988）]在这里在＃PHI＃〜4模型中进行了分析。结果表明，它可以直接与过渡的位移程度直接相关，如通过比率C / E_0所描述的，在驱动过渡的非局部耦合C和能量阱的深度E_0之间的位移与位移相关。扭曲的结构。但是，随着C / E_0的降低，即对于更接近无序限制的系统，Rhodes-Wohlfarth参数变得渐近恒定。在这种观点下，解释了对于该实验参数观察到的非常有限的值范围，并且表明，通常，在相当位移的情况下，它只能定量评估过渡特征。该论点可以推广到更复杂的系统，并且当应用于众所周知的材料时，可以对位移较大的铁电体中的位移程度和相关的微观高能参数进行粗略估计。

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