Low-frequency negative capacitance in La0.8Sr0.2MnO3/Nb-doped SrTiO3 heterojunction

被引：49
|
作者：
Wang, C. C. [1 ]
Liu, G. Z. [1 ]
He, M. [1 ]
Lu, H. B. [1 ]
机构：
[1] Chinese Acad Sci, Inst Phys, Beijing Natl Lab Condensed Matter Phys, Beijing 100080, Peoples R China
来源：
APPLIED PHYSICS LETTERS | 2008年 / 92卷 / 05期
基金：
中国国家自然科学基金; 中国博士后科学基金;
关键词：
D O I：
10.1063/1.2840195
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
Low-frequency (100 Hz <= f <= 1 MHz) dielectric properties of La0.8Sr0.2MnO3/Nb-doped SrTiO3 heterojunctions were investigated in detail at room temperature. Negative capacitance was observed at low frequencies under positive dc biases. This phenomenon was found to result from the combinational contributions from the Maxwell-Wagner interfacial relaxation and the dipolar relaxation related to detrapped carriers which give rise to inductive effect under an applied electric field. (C) 2008 American Institute of Physics.
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页数：3
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