کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8000968 | 1516277 | 2014 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Study of electrical transport and magnetoresistive properties of La0.67âx DyxPb0.33 MnO3 (x = 0.00, 0.10 and 0.15)
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
فلزات و آلیاژها
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
We investigate the influence of dysprosium (Dy) doping on the magneto-electrical properties of LPMDyx compounds. The temperature dependence of electrical resistivity shows that all samples undergo a sharp metal-semiconductor (M-SC) transition at a temperature (TM-SC), accompanying the ferromagnetic-paramagnetic transition. Metallic resistivity Ï(T)Â =Â Ï0Â +Â Ï1T2 is observed below TM-SC. Above TM-SC, the electrical conductivity is dominated by adiabatic small polaron hopping model, inducing electrical resistivity in the paramagnetic region as ÏPM(T)=CTexpEakBT. A percolation theory is introduced to understand the properties of these mixed systems. We have also found that the estimated results are in good agreement with the experimental data. Above all, the magnetoresistance (MR) study showed a peak which has a great value around the metal-semiconductor (M-SC) transition temperature. The dependence of resistivity on the temperature and magnetic field data is used to deduce the magnetic entropy change.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Alloys and Compounds - Volume 616, 15 December 2014, Pages 378-384
Journal: Journal of Alloys and Compounds - Volume 616, 15 December 2014, Pages 378-384
نویسندگان
N. Zaidi, S. Mnefgui, A. Dhahri, J. Dhahri, E.K. Hlil,