کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1801561 1024572 2008 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
The effect of annealing process on the physical properties of La1−xNaxMnOy
موضوعات مرتبط
مهندسی و علوم پایه فیزیک و نجوم فیزیک ماده چگال
پیش نمایش صفحه اول مقاله
The effect of annealing process on the physical properties of La1−xNaxMnOy
چکیده انگلیسی
The effect of Na doping and annealing time on the structure, electrical properties, magnetoresistance and thermopower properties has been investigated in perovskite La1−xNaxMnOy (x=0.025, 0.075 and 0.1) systems. La1−xNaxMnOy crystallizes in a single-phase rhombohedral structure. It is observed a simultaneous occurrence of the ferromagnetic to paramagnetic state and metallic to insulating state. In the meanwhile, a large negative magnetoresistance with low applied magnetic field is observed. In addition, ρ(T) curves for Na-doped samples exhibit another broad transition Tms2 below Tms. Such double peak behavior in the ρ(T) curve interpreted by the electronic inhomogeneity in the samples. The sign of S changes from positive to negative depending on composition. The values of Seebeck coefficient are small (in the microvolt range).
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Magnetism and Magnetic Materials - Volume 320, Issue 6, March 2008, Pages L43-L49
نویسندگان
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