Low-temperature resistance and magnetoresistance hysteresis in polycrystalline (La0.5Eu0.5)(0.7)Pb0.3MnO3

Тип публикации: статья из журнала

Год издания: 2011

Идентификатор DOI: 10.1063/1.3559303

Ключевые слова: Antiferromagnets, Electrical resistances, Ferromagnets, Field dependence, Inter-grain, Lanthanum manganites, Low temperatures, Low-temperature resistance, Polycrystalline, Temperature dependence, Tunnel contacts, Antiferromagnetic materials, Europium, Ferromagnetic materials, Ferromagnetism, Hysteresis, Lead, Magnetic field effects, Magnetoelectronics, Magnetoresistance, Magnets, Manganese oxide, Paramagnetism, Superconducting materials, Electric resistance

Аннотация: The behavior of temperature dependences of electrical resistance and magnetoresistance of polycrystalline substituted lanthanum manganite (La0.5Eu0.5)(0.7)Pb0.3MnO3 at low temperatures was thoroughly studied. A broad hysteresis was found in the field dependences of electrical resistance in the low-temperature region. Above 40 K, no hysteresis feature was observed. The temperature T = 40 K corresponds to the temperature of minimum electrical resistance and the temperature T-N to the antiferromagnet-paramagnet phase transition of the material of the intergrain boundaries. In this work we propose a model which explains the observed features of the rho(T) and rho(H) curves at temperatures below T-N by the formation of a network of ferromagnet-antiferromagnet-ferromagnet tunnel contacts. (C) 2011 American Institute of Physics. [doi:10.1063/1.3559303]

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Издание

Журнал: JOURNAL OF APPLIED PHYSICS

Выпуск журнала: Vol. 109, Is. 5

ISSN журнала: 00218979

Место издания: MELVILLE

Издатель: AMER INST PHYSICS

Авторы

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

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