Series resistance effects in La0.5Ca0.5MnO3/SrTiO3:Nb(001) heterojunctions

被引：5
作者：
Wang, J. F. [1 ,2 ]
Cao, D. [1 ]
Zhou, Y. [1 ]
Wang, X. Y. [1 ]
Jiao, Z. W. [1 ]
Gao, J. [2 ]
机构：
[1] China Jiliang Univ, Dept Phys, Hangzhou 310018, Zhejiang, Peoples R China
[2] Univ Hong Kong, Dept Phys, Hong Kong, Hong Kong, Peoples R China
来源：
JOURNAL OF PHYSICS D-APPLIED PHYSICS | 2015年 / 48卷 / 38期
关键词：
manganites; heterojunction; current-voltage characteristic; series resistance; NB-DOPED SRTIO3; MAGNETORESISTANCE; CROSSOVER;
D O I：
10.1088/0022-3727/48/38/385104
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
The effects of series resistance in heterojunctions composed of La0.5Ca0.5MnO3 (LCMO) and Nb:SrTiO3 with 0.05 wt.% and 0.7 wt.% of Nb doping (0.05NbSTO and 0.7NbSTO) have been investigated in detail using current-voltage curves with and without light illumination. Two linear plots, namely, dV/dlnJ versus J and H(J)[ V-(nk(B)T/q)ln(J/A**T-2)] versus J, have been used to extract the series resistance. These two plots give very close values. The extracted series resistance exhibits a monotonous increase with decreasing temperatures, which could explain the observed anomalous temperature dependence of short circuit current in LCMO/0.7NbSTO.
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页数：6
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