Structural and charge transport properties of electron-doped manganites (La1-xPrx)0.85Zr0.15MnO3

被引：3
作者：
Ling, D. C. [1 ]
Hsu, P. C. [1 ]
Chien, F. Z. [1 ]
机构：
[1] Tamkang Univ, Dept Phys, Tamsui 25137, Taiwan
来源：
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 2006年 / 304卷 / 01期
关键词：
Electron-doped manganites; Average A-site ionic radius; Magnetoresistance; Double exchange mechanism;
D O I：
10.1016/j.jmmm.2006.02.049
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The structural and magneto-transport properties of electron-doped manganites (La1-xPrx)(0.85)Zr0.15MnO3 (Pr-doped LZMO) with x = 0, 0.05, 0.10, 0.15, and 0.20 have been investigated. X-ray diffraction (XRD) patterns show that the Pr-doped LZMO has rhombohedral lattice structure with R (3) over barC space group. The Mn-O-Mn bond angle of the system refined by Rietveld technique decreases with increasing Pr content ranging from 165.38 degrees for x = 0 to 163.64 degrees for x = 0.20. A significant distortion of the MnO6 octahedra caused by the distinctively small Mn-O-Mn bond angle weakens the strength of Mn2+-O-Mn3+ double exchange (DE) interaction. The Curie temperature T-C increases with increasing average A-site ionic radius, < r(A)>, and the magnetoresistance (MR) ratio decreases with increasing < r(A)>, strongly suggesting that the DE mechanism plays an important role in the charge transport property of the Pr-doped LZMO. (C) 2006 Elsevier B. V. All rights reserved.
引用
收藏
页码：E340 / E342
页数：3
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