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, 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]

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Выпуск журнала: Vol. 109, Is. 8

ISSN журнала: 00218979

Место издания: MELVILLE



  • 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)