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, noПоказать полностьюhysteresis 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]
Журнал: JOURNAL OF APPLIED PHYSICS
Выпуск журнала: Vol. 109, Is. 5
ISSN журнала: 00218979
Место издания: MELVILLE
Издатель: AMER INST PHYSICS