Dielectric anomaly due to electrostatic coupling in ferroelectric-paraelectric bilayers and multilayers
Dielectric anomaly due to electrostatic coupling in ferroelectric-paraelectric bilayers and multilayers
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DOI：
10.1063/1.2032601
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发表时间：
2005-08
影响因子：
4
通讯作者：
A. Roytburd;S. Zhong;S. Alpay
中科院分区：
文献类型：
--
作者：
A. Roytburd;S. Zhong;S. Alpay
提出了一个描述铁电-顺电双层膜和多层膜的极化和介电响应的热力学模型。结果表明，在一个临界顺电层厚度的铁电性的抑制层之间的强静电耦合的结果。双层预计将有一个巨大的介电响应类似的居里-外斯温度附近的介电异常均匀铁电体在这个临界厚度。对赝象的（001）SrTiO_3上的（001）BaTiO_3 ~（3+）SrTiO_3异质外延双层膜和无应力的BaTiO_3 ~（3+）SrTiO_3双层膜进行了数值分析。完全极化抑制和介电峰预计发生在约66%和14%的SrTiO 3在这两个系统中，分别。
A thermodynamic model is presented that describes the polarization and the dielectric response of ferroelectric-paraelectric bilayers and multilayers. It is shown that a strong electrostatic coupling between the layers results in the suppression of ferroelectricity at a critical paraelectric layer thickness. The bilayer is expected to have a gigantic dielectric response similar to the dielectric anomaly near Curie–Weiss temperature in homogeneous ferroelectrics at this critical thickness. A numerical analysis is carried out for a pseudomorphic (001) BaTiO3∕SrTiO3 heteroepitaxial bilayer on (001) SrTiO3 and a stress-free BaTiO3∕SrTiO3 bilayer. Complete polarization suppression and a dielectric peak are predicted to occur at approximately 66% and 14% of SrTiO3 in these two systems, respectively.