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arXiv 2408.09137cond-mat.soft
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单轴铁电近晶A液晶相的平均场理论

Mean-field theory of the uniaxial ferroelectric smectic A liquid crystal phase

Aitor Erkoreka, Minjung Huang, Satoshi Aya, Josu Martinez-Perdiguero

AI总结:

本文提出了一个平均场分子模型,用两个参数成功捕捉了铁电近晶A相(SmAF)的丰富相图,并通过实验测量验证了模型预测。

摘要:

继铁电向列液晶相(NF)这一突破性发现之后,一系列密切相关的新极性相也被发现。其中特别有趣的是铁电近晶A相(SmAF),它在NF领域的少数材料中被观察到,具有沿层法线的自发极化。在此,我们提出了一个平均场分子模型,该模型成功用两个参数捕捉了文献中实验观察到的丰富相图。此外,我们在一种表现出SmAF相的化合物中进行了二次谐波生成、X射线衍射和双折射测量,以确定合适的序参数,并与模型预测进行比较。

英文摘要:

Following the groundbreaking discovery of the ferroelectric nematic liquid crystal phase (NF), a series of closely-related new polar phases have also been found. An especially interesting one is the ferroelectric smectic A phase (SmAF) with spontaneous polarization along the layer normal observed in a few materials of the NF realm. Here, we present a mean-field molecular model that successfully captures the rich phase diagrams experimentally observed in the literature in terms of two parameters. Additionally, we carry out second harmonic generation, X-ray diffraction and birefringence measurements in a compound exhibiting the SmAF phase to determine the appropriate order parameters and compare with the model predictions.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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