کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1527352 | 1511857 | 2007 | 4 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
The coexistence and competition of low-field magnetoresistance and colossal magnetoresistance in polycrystalline La0.49Sr0.51(Mn1âxNbx)O3
دانلود مقاله + سفارش ترجمه
دانلود مقاله ISI انگلیسی
رایگان برای ایرانیان
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
مواد الکترونیکی، نوری و مغناطیسی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
The magnetic and transport properties of polycrystalline La0.49Sr0.51(Mn1âxNbx)O3 have been studied by the measurement of dc magnetization and magnetoresistance (MR). With the increase of Nb doping, the ferromagnetism evolves from the inferior position in the x = 0 sample to the dominant position in the x = 0.05 and 0.15 samples, and then to the inferior position again in the x = 0.25 sample. Therefore, there are not enough ferromagnetic domains to form percolative conduction paths in the x = 0 and 0.25 samples, as a result, no obvious MR has been found under a 4500 Oe magnetic field in the two samples. But the intrinsic colossal MR (CMR) effect and the extrinsic low-field MR (LFMR) effect have been observed coexisting in the samples of x = 0.05 and 0.15 under 4500 Oe. On the other hand, the anisotropic MR has been observed in the x = 0.05 and 0.15 samples when a 4500 Oe field is respectively applied perpendicular and parallel to the plane of the pellet-shape samples. The anisotropic MR is attributed to the existence of LFMR.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Chemistry and Physics - Volume 103, Issues 2â3, 15 June 2007, Pages 437-440
Journal: Materials Chemistry and Physics - Volume 103, Issues 2â3, 15 June 2007, Pages 437-440
نویسندگان
Deliang Zhu, Qiqing Shu, Wenjun Liu, Xiaocui Ma, Peijiang Cao, S.M. Bhagat, S.E. Lofland, I.O. Troyanchuk,