کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7998484 | 1516249 | 2015 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Electrical and magnetic properties of Y-doped La0.5Sr0.5MnO3 manganite system: Observation of step-like magnetization
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
فلزات و آلیاژها
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Electrical and magnetic properties of Y-doped La0.5Sr0.5MnO3 manganite system: Observation of step-like magnetization Electrical and magnetic properties of Y-doped La0.5Sr0.5MnO3 manganite system: Observation of step-like magnetization](/preview/png/7998484.png)
چکیده انگلیسی
The magnetic and transport properties of bulk doped manganite, La0.5âyYySr0.5MnO3 have been studied as a function of (Y) yttrium doping, y, for 0 ⩽ y ⩽ 0.25. In the absence of the yttrium this is a well studied half-doped manganite which is a metallic ferromagnet. With successive doping of Y the system undergoes a transformation from rhombohedral (space group R3¯-C) to orthorhombically (space group Pnma) distorted perovskite structure, due to the large distortions caused by the yttrium; this is seen directly from the softening of the Mn-O stretching mode (around 600 cmâ1) as a function of Y3+ doping which has relatively lower ionic radius compared to La3+ and Sr2+. These distortions make this series of compounds particularly interesting. The magnetization obtained in zero field cooled (ZFC) and field cooled (FC) studies show dramatic changes as the value of y is raised above 0.05. This is accompanied by a transition from the metallic and into a semiconducting state as is seen from the studies of the electrical resistivity. The magnetic behavior is further investigated by a study of the hysteresis loops, frequency dependent susceptibility and studies of the magnetic relaxation. The results are understood in terms of the average size of the cation on the A site, ãrAã, and the variance, Ï2 (=âyi2ri2 â ãrAã2). The value of the variance, Ï2, increases rapidly with doping, y, induces weakening of the long range ferromagnetic ordering, exhibiting a stepwise variation of magnetization (metamagnetic like). Based on the present results a magnetic phase diagram has been drawn demonstrating different magnetic phase sequences with the variation of Ï2.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Alloys and Compounds - Volume 644, 25 September 2015, Pages 363-370
Journal: Journal of Alloys and Compounds - Volume 644, 25 September 2015, Pages 363-370
نویسندگان
Subhrangsu Taran, C.P. Sun, C.L. Huang, H.D. Yang, A.K. Nigam, B.K. Chaudhuri, S. Chatterjee,