Тип публикации: статья из журнала
Год издания: 2010
Идентификатор DOI: 10.1088/1742-6596/200/5/052025
Ключевые слова: Antiferromagnetic grains, Comparative analysis, Ferromagnetic grain, Low temperatures, Polycrystalline, Specific heat measurement, Spin dependent tunneling, Transport and magnetic properties, Antiferromagnetism, Electric resistance, Europium, Grain boundaries, Grain size and shape, Lanthanum compounds, Lead, Magnetic field effects, Magnetic properties, Magnetoresistance, Manganese oxide, Single crystals, Thermal variables measurement, Lanthanum
Аннотация: The effect of grain boundaries on magnetoresistance (MR) of manganites have been investigated by the comparative analysis of the properties of single-crystal and polycrystalline (La0.5Eu0.5) 0.7Pb0.3MnO3. While MR of the single crystal is maximum near the Curie temperature and vanishes in the low-temperature region, the polycrystalПоказать полностьюline (La0.5Eu0.5)0.7Pb 0.3MnO3 sample exhibits high MR in the low-temperature region. In order to clarify the origin of the low-temperature MR, the transport and magnetic properties of the polycrystalline (La0.5Eu 0.5)0.7Pb0.3MnO3 in magnetic fields have been supplemented by study of magnetic properties and specific heat measurements. The results obtained could be attributed to spin-dependent tunneling between ferromagnetic grains through insulating antiferromagnetic grain boundaries. © 2010 IOP Publishing Ltd.
Журнал: International Conference on Magnetism, ICM 2009 (26 July 2009 through 31 July 2009, Karlsruhe
Выпуск журнала: Vol. 200, Is. SECTION 5