Self-organization into ferroelectric and antiferroelectric crystals via the interplay between particle shape and dipolar interaction

Takae Kyohei; Tanaka Hajime

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Self-organization into ferroelectric and antiferroelectric crystals via the interplay between particle shape and dipolar interaction

机译：Self-organization into ferroelectric and antiferroelectric crystals via the interplay between particle shape and dipolar interaction

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摘要

Ferroelectricity and antiferroelectricity are widely seen in various types of condensed matter and are of technological significance not only due to their electrical switchability but also due to intriguing cross-coupling effects such as electro-mechanical and electro-caloric effects. The control of the two types of dipolar order has practically been made by changing the ionic radius of a constituent atom or externally applying strain for inorganic crystals and by changing the shape of a molecule for organic crystals. However, the basic physical principle behind such controllability involving crystal-lattice organization is still unknown. On the basis of a physical picture that a competition of dipolar order with another type of order is essential to understand this phenomenon, here we develop a simple model system composed of spheroid-like particles with a permanent dipole, which may capture an essence of this important structural transition in organic systems. In this model, we reveal that energetic frustration between the two types of anisotropic interactions, dipolar and steric interactions, is a key to control not only the phase transition but also the coupling between polarization and strain. Our finding provides a fundamental physical principle for self-organization to a crystal with desired dipolar order and realization of large electro-mechanical effects.

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来源
《Proceedings of the National Academy of Sciences of the United States of America.》 |2018年第40期|9917-9922|共6页
作者
Takae Kyohei; Tanaka Hajime;
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作者单位

Univ Tokyo, Inst Ind Sci, Dept Fundamental Engn, Tokyo 1538505, Japan;

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收录信息美国《科学引文索引》(SCI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
原文格式 PDF
正文语种英语
中图分类自然科学总论;
关键词
dipolar crystal; ferroelectricity; antiferroelectricity; structural phase transition; mechanical switching;

Self-organization into ferroelectric and antiferroelectric crystals via the interplay between particle shape and dipolar interaction

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