Nonlinear effects and Joule heating in I-V curves in manganites -: art. no. 023911

被引：52

作者：

Mercone, S ^{[1
]}

Frésard, R

Caignaert, V

Martin, C

Saurel, D

Simon, C

André, G

Monod, P

Fauth, F

机构：

[1] CNRS, Lab Cristallog & Sci Materlaux, UMR 6508, Ecole Natl Super Ingn Caen, F-14050 Caen, France

[2] CNRS, Ctr Rech, ENSICAEN, F-14050 Caen, France

来源：

JOURNAL OF APPLIED PHYSICS | 2005年 / 98卷 / 02期

关键词：

D O I：

10.1063/1.1993750

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We study the influence of the Joule effect on the nonlinear behavior of the transport I-V curves in polycrystalline samples of the manganite Pr0.8Ca0.2MnO3 by using the crystalline unit-cell parameters as an internal thermometer in x-ray and neutron diffractions. We develop a simple analytical model to estimate the temperature profile in the samples. Under the actual experimental conditions we show that the internal temperature gradient or the difference between the temperature of the sample and that of the thermal bath is at the origin of the nonlinearity observed in the I-V curves. Consequences on other compounds with colossal magnetoresistance are also discussed. (c) 2005 American Institute of Physics.

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页数：5

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