Direct Observation of Stable Negative Capacitance in SrTiO3@BaTiO3 Heterostructure
Direct Observation of Stable Negative Capacitance in SrTiO3@BaTiO3 Heterostructure
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直接观察 SrTiO3@BaTiO3 异质结构中稳定的负电容
DOI：
10.1002/aelm.201901005
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发表时间：
2019-12
影响因子：
6.2
通讯作者：
Guo Zhanhu
中科院分区：
文献类型：
--
作者：
Wang Zhongyang;Li Hongyu;Hu Huiying;Fan Yuqi;Fan Runhua;Li Baowen;Zhang Jiaoxia;Liu Hu;Fan Jincheng;Hou Hua;Dang Feng;Kou Zongkui;Guo Zhanhu
近年来，铁电材料中的负电容似乎取得了显著的进展。然而，由于负电容在静电场中的不稳定特性，直接测量负电容一直是一个挑战。提出了一种利用高频交变电场下的介质谐振来设计稳定的负电容的巧妙方法。研究了由外延核壳颗粒组成的BaTiO_3/SrTiO_3(BT/ST)块体陶瓷的显著介电共振和电学性能。由于负电容可以看作是一种电感行为，因此可以发生由LC谐振引起的介电常数的介电谐振。介电共振可以用洛伦兹模型来描述，并可以用BT中TO2声子的类Fano共振来解释。此外，在有效居里温度下观察到最低的共振频率。得益于BT/ST陶瓷的负电容，高介电常数和负介电常数都伴随着谐振频率附近的低损耗，这对开发电容器和超材料是有益的。值得注意的是，这项工作将为获得铁电体在频谱中的显式负电容提供一条主动的途径。
Negative capacitance in ferroelectrics has seem remarkable progress in recent years. However, direct measurement of negative capacitance has so far been a challenge due to its instable characteristic in the electrostatic field. An ingenious method to design stable negative capacitance by dielectric resonance under high‐frequency alternating electric fields is demonstrated. The well‐pronounced dielectric resonance and electrical property in BaTiO3/SrTiO3 (BT/ST) bulk ceramics consisted of epitaxial core–shell particles are studied. As the negative capacitance can be considered as an inductive behavior, the dielectric resonance of permittivity induced by a LC resonance can be occurred. The dielectric resonance can be described by the Lorentz model and explained by Fano‐like resonance of TO2 phonon in BT. In addition, lowest resonant frequency is observed at effective Curie temperature. Benefiting from negative capacitance in the BT/ST ceramics, both high permittivity and negative permittivity are accompanied with low losses around the resonant frequency, which is useful for developing capacitors and metamaterials. Significantly, this work will provide an initiative avenue to obtain explicit negative capacitance of ferroelectrics in the frequency spectrum.
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