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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