铁电性
超晶格
材料科学
凝聚态物理
电介质
极化(电化学)
X射线光电子能谱
脉冲激光沉积
氧气
光电子学
薄膜
纳米技术
核磁共振
化学
物理
物理化学
有机化学
作者
Jun Liang Lin,Yuanwei Sun,Ri He,Yanxi Li,Zhicheng Zhong,Peng Gao,Xiang Zhao,Zhidong Zhang,Zhan Jie Wang
出处
期刊:Nano Letters
[American Chemical Society]
日期:2022-08-19
卷期号:22 (17): 7104-7111
被引量:9
标识
DOI:10.1021/acs.nanolett.2c02175
摘要
Artificial superlattices have demonstrated many unique phenomena not found in bulk materials. For this investigation, SrTiO3/SrRuO3 paraelectric/metallic superlattices with various stacking periods were synthesized via pulsed laser deposition. A robust room-temperature ferroelectric polarization (∼46 μC/cm2) was found in the superlattices with 2 unit cell (u.c.) thick SrRuO3 layers, despite the fact that neither SrTiO3 nor SrRuO3 is inherently ferroelectric. Results obtained from atomically resolved elemental mapping and X-ray photoelectron spectroscopy verified that oxygen vacancies accumulated at the SrTiO3/SrRuO3 interfaces, causing lattice distortions and increased tetragonality (c/a). The observed ferroelectric responses can be mainly attributed to the broken spatial inversion symmetry induced by the ordered distribution of oxygen vacancies at the SrTiO3/SrRuO3 interfaces, coupled with the triggering of external electric field. The resulting polarization mechanism induced by oxygen vacancies suggests viable ways for improving the electrical properties of ferroelectric materials, with the goal of expanding the functionality of a range of electronic devices.
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