Magnetoresistance of substituted lanthanum manganites La0.7Ca0.3MnO3 upon nonequilibrium overheating of carriers

被引：2

作者：

Shaykhutdinov, K. A. ^{[1
,2
]}

Semenov, S. V. ^{[1
]}

Popkov, S. I. ^{[1
,2
]}

Balaev, D. A. ^{[1
,2
]}

Bykov, A. A. ^{[1
]}

Dubrovskiy, A. A. ^{[1
,2
]}

Petrov, M. I. ^{[1
]}

Volkov, N. V. ^{[1
,2
]}

机构：

[1] Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia

[2] Siberian Fed Univ, Krasnoyarsk 660041, Russia

来源：

JOURNAL OF APPLIED PHYSICS | 2011年 / 109卷 / 08期

基金：

俄罗斯基础研究基金会;

关键词：

D O I：

10.1063/1.3573666

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Current-voltage characteristics of the polycrystalline substituted lanthanum manganite La0.7Ca0.3MnO3 were experimentally studied at T - 77.4 K in magnetic fields up to 13 kOe. In these characteristics, a portion of negative differential resistivity was observed above a certain threshold value of critical current density j caused, in our opinion, by nonequilibrium heating of the electron gas due to low thermal conductivity of the manganite material. Because of the nonlinearity of the current-voltage characteristics, the field dependences of resistivity rho( H) appear extremely sensitive to the value of a transport current. In this case, the rho( H) dependences reveal both ordinary negative and positive magnetoresistance. (C) 2011 American Institute of Physics. [doi: 10.1063/1.3573666]

引用

页数：5

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