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]
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页数：5
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