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

Тип публикации: статья из журнала

Год издания: 2011

Идентификатор DOI: 10.1063/1.3573666

Ключевые слова: Field dependence, Lanthanum manganites, Low thermal conductivity, Manganite materials, Negative differential resistivity, Non equilibrium, Non-Linearity, Nonequilibrium heating, Polycrystalline, Positive magnetoresistance, Transport currents, Electric resistance, Electron gas, Heating, Lanthanum, Lanthanum alloys, Magnetic fields, Magnetoelectronics, Magnetoresistance, Manganese oxide, Manganites, Thermal conductivity, Current voltage characteristics

Аннотация: 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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Издание

Журнал: JOURNAL OF APPLIED PHYSICS

Выпуск журнала: Vol. 109, Is. 8

ISSN журнала: 00218979

Место издания: MELVILLE

Издатель: AMER INST PHYSICS

Персоны

Shaykhutdinov K.A. (Siberian Federal University)
Semenov S.V. (Kirensky Institute of Physics,Russian Academy of Sciences,Siberian Branch)
Popkov S.I. (Siberian Federal University)
Balaev D.A. (Siberian Federal University)
Bykov A.A. (Kirensky Institute of Physics,Russian Academy of Sciences,Siberian Branch)
Dubrovskiy A.A. (Siberian Federal University)
Petrov M.I. (Kirensky Institute of Physics,Russian Academy of Sciences,Siberian Branch)
Volkov N.V. (Siberian Federal University)

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