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

页码：E340 / E342

页数：3