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, Показать полностьюin 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]
Журнал: JOURNAL OF APPLIED PHYSICS
Выпуск журнала: Vol. 109, Is. 8
ISSN журнала: 00218979
Место издания: MELVILLE
Издатель: AMER INST PHYSICS