Ferroelectricity in Layered Perovskites as a Model of Ultra-Thin Films
Ferroelectricity in Layered Perovskites as a Model of Ultra-Thin Films作者机构：Department of Physics Hokkaido University Sapporo Japan
出 版 物：《World Journal of Condensed Matter Physics》 (凝固态物理国际期刊（英文）)
年 卷 期：2016年第6卷第3期
页 面：224-243页
学科分类：07[理学] 070205[理学-凝聚态物理] 0702[理学-物理学]
主 题：Ferroelectricity Layered Oxide Perovskite Thin Film Size Effect
摘 要：The instability of thin ferroelectric films is discussed based on the close similarity of dielectric properties between bulk Bi-layered perovskites and thin BaTiO3 films. The dielectric properties of pseudo-two-dimensional layered perovskites suggest that the bulk layered ferroelectric is a good model of ultra-thin ferroelectric film with a few perovskite units, free from any misfit lattice strain. It seems plausible that the ferroelectric interaction is still prominent but shows a crossover from ferroelectric to antiferroelectric along the unique c-axis (perpendicular to the film plane);with decreasing thickness, the ferroelectricity appears within the plane, which results in so-called “canted ferroelectricity. An extra relaxation mode induced by surface effect of thin films correlates with soft mode, which results in a new intermediate phase between the paraelectric and ferroelectric phases. These evidences may indicate no critical thickness even for ferroelectric ultra- thin films.
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