کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1596428 | 1515713 | 2008 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Electrical transport properties of sintered granular manganite/insulator systems
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
دانش مواد (عمومی)
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Magnetic, structural and transport measurements on granular [La0.7Sr0.3MnO3]1âx[Insulator]x pellets were carried out. The system displayed a conduction threshold at x>30%, i.e., for a La0.7Sr0.3MnO3 volume fraction XFMâ¼70%. Beyond this value, the resistivity increased steeply, setting up a rather insulating behavior. Nevertheless, the maximum enhancement in magnetoresistance was observed at a concentration x=xcâ¼10% at low temperatures and â¼20% at room temperature. This result was demonstrated to be independent of the applied magnetic field strength. The observed magnetoresistance enhancement seemed to be consistent with the disorder-driven amplification of spin-dependent transport at the structural boundaries of the mixture, due to the presence of the insulating material within the ferromagnetic matrix.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Solid State Communications - Volume 145, Issues 1â2, January 2008, Pages 66-71
Journal: Solid State Communications - Volume 145, Issues 1â2, January 2008, Pages 66-71
نویسندگان
L.K. Gil, E. Baca, O. Morán, C. Quinayas, G. Bolaños,