Positive temperature coefficient of resistivity in Pt/(Ba0.7Sr0.3)TiO3/YBa2Cu3O7-x capacitors

被引：13
|
作者：
Yang, H [1 ]
Chen, B [1 ]
Miao, J [1 ]
Zhao, L [1 ]
Xu, B [1 ]
Dong, XL [1 ]
Cao, LI [1 ]
Qiu, XG [1 ]
Zhao, BR [1 ]
机构：
[1] Chinese Acad Sci, Inst Phys, Natl Lab Superconduct, Beijing 100080, Peoples R China
来源：
APPLIED PHYSICS LETTERS | 2004年 / 85卷 / 21期
基金：
中国国家自然科学基金;
关键词：
D O I：
10.1063/1.1827928
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
Pt/(Ba0.7Sr0.3)TiO3(BST)/YBa2Cu3O7-x(YBCO) capacitors were fabricated on (001) LaAlO3 substrates. The leakage current density-electric field characteristics were measured in the temperature range from 20 to 300 K. In the electric field region of >0.7 MV/cm for positively biased Pt electrode and >1.4 MV/cm for negatively biased Pt electrode, the leakage current shows space-charge-limited-current behavior from 20 to 250 K. Meanwhile a positive temperature coefficient of resistivity (PTCR) in the temperature range from 20 to 150 K was observed and attributed to the strong negative temperature dependence of the dielectric constant of BST thin films. (C) 2004 American Institute of Physics.
引用
收藏
页码：5019 / 5021
页数：3
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