Insulator-metal transition and the magnetic phase diagram of La1-xTexMnO3 (0.1 ≤ x ≥ 0.6)

被引：15
|
作者：
Yang, J
Song, WH
Ma, YQ
Zhang, RL
Zhao, BC
Sheng, ZG
Zheng, GH
Dai, JM
Sun, YP [1 ]
机构：
[1] Chinese Acad Sci, Inst Solid State Phys, Key Lab Mat Phys, Hefei 230031, Peoples R China
[2] Nanjing Univ, Natl Lab Solid State Microstruct, Nanjing 210008, Peoples R China
来源：
MATERIALS CHEMISTRY AND PHYSICS | 2005年 / 94卷 / 01期
关键词：
magnetic materials; Rietveld analysis; transport properties;
D O I：
10.1016/j.matchemphys.2005.04.012
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The structural, electrical transport and magnetic properties of perovskite oxides La1-xTexMnO3 (0.1 <= x <= 0.6) have been investigated and thus the magnetic phase diagram of La(1-x)TexMnO(3) (0.1 <= x <= 0.6) compounds as a function of temperature and the doping level x has been obtained. All samples have rhombohedral structure and undergo paramagnetic-ferromagnetic (PM-FM) transition accompanied with metal-insulator transition (MIT). A charge ordering (CO) transition begins to appear at T-CO similar to 250 K for the sample with x = 0.60. Moreover, the variation of the Curie temperature T-c and the MIT temperature T-p is quite complex and the results are discussed in terms of three factors including the average A-site cation radius (r(A)), the size mismatch sigma(2) and the Te content. In addition, there is an evidence for magnetoresistance (MR) at low-temperatures for all samples. (c) 2005 Elsevier B.V. All rights reserved.
引用
收藏
页码：62 / 68
页数：7
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