Effect of aluminum doping on the magneto-transport properties of La0.75Ca0.25MnO3

被引：10
|
作者：
Bathe, R
Shinde, SR
Gapchup, KM
Adhi, KP
Patil, SI
机构：
[1] Univ Pune, Ctr Adv Studies Mat Sci & Solid State Phys, Dept Phys, Pune 411007, Maharashtra, India
[2] Univ Maryland, Dept Phys, Ctr Superconduct Res, College Pk, MD 20742 USA
来源：
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 2003年 / 256卷 / 1-3期
关键词：
colossal magnetoresistance; perovskite structure; doping; double exchange; metal-insulator transition;
D O I：
10.1016/S0304-8853(02)00978-2
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The influence of aluminum doping at Mn-site in La0.75Ca0.25MnO3 has been investigated, in the light of magnetotransport, and structural properties. As the aluminum concentration increases, the metal-insulator transition temperature (T-p) decreases while activation energy in the insulating region (T > T-p), resistivity and maximum value of magnetoresistance (MR) increases. The unit cell volume decreases slightly as the aluminum concentration increases. The observed results are analyzed in term of defect clustering due to aluminum doping at Mn-site induced random spin disorder and local strain and its effect on the magnetotransport properties. (C) 2002 Elsevier Science B.V. All rights reserved.
引用
收藏
页码：425 / 429
页数：5
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