Current localization and Joule self-heating effects in Cr-doped Nd0.5Ca0.5MnO3 manganites -: art. no. 012410

被引：31
|
作者：
Carneiro, AS
Jardim, RF
Fonseca, FC
机构：
[1] Univ Sao Paulo, Inst Fis, BR-05315970 Sao Paulo, Brazil
[2] IPEN, BR-05422970 Sao Paulo, Brazil
来源：
PHYSICAL REVIEW B | 2006年 / 73卷 / 01期
基金：
巴西圣保罗研究基金会;
关键词：
D O I：
10.1103/PhysRevB.73.012410
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The effects of dc excitation current on the current-voltage curves of polycrystalline samples of Nd0.5Ca0.5Mn0.96Cr0.04O3 were investigated. The experimental results show that an abrupt jump of the voltage is concomitant with a huge increase in the temperature of the sample. A simple model and estimates for Joule self-heating effects support the experimental data. Moreover, the data strongly suggest that both the current localization in the metallic paths and local Joule self-heating effects are essential ingredients to understand the current-induced phase transition in phase-separated manganites.
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页数：4
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