کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1804286 1024646 2007 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Oxygenation-induced two peaks in the self-doped La0.9MnO3+δ compounds
موضوعات مرتبط
مهندسی و علوم پایه فیزیک و نجوم فیزیک ماده چگال
پیش نمایش صفحه اول مقاله
Oxygenation-induced two peaks in the self-doped La0.9MnO3+δ compounds
چکیده انگلیسی

A series of self-doped La0.9MnO3+δ compounds have been fabricated by the solid-state reaction method with different post-annealing and oxygenation processes. The temperature dependence of resistivity measured at several magnetic fields indicated that all of these samples have an insulator–metal transition with a large negative colossal magnetoresistance (CMR) ratio. The resistivity, maximum CMR ratio and peak position are dominated by the oxygen content. As the oxygen content increases, the resistivity decreases, the peak position shifts to higher temperature and the maximum CMR ratio increases, respectively; meanwhile the peak number in the R–T curve is changed from 1 to 2, then from 2 to 1. The temperature dependencies of magnetization and specific heat show the evidence of magnetic phase transition in these samples. We think that two peaks contributed by the different oxygen-induced ferromagnetic phases resulted in the phase separation of the sample.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Magnetism and Magnetic Materials - Volume 311, Issue 2, April 2007, Pages 623–629
نویسندگان
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