Double M-I transitions and low-temperature resistivity minimum of La2/3Ca1/3Mn1-xCoxO3(0≤x≤0.15) manganite

被引：23
|
作者：
Yu, Qianying [1 ]
Zhang, Jincang [1 ]
Jia, Rongrong [1 ]
Jing, Chao [1 ]
Cao, Shixun [1 ]
机构：
[1] Shanghai Univ, Dept Phys, Shanghai 200436, Peoples R China
来源：
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 2008年 / 320卷 / 23期
基金：
中国国家自然科学基金;
关键词：
Manganite; Mn site substitution; Double metal-insulator transition; Resistivity minimum;
D O I：
10.1016/j.jmmm.2008.07.016
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
A series of Mn-site Co-doping samples La2/3Ca1/3Mn1-xCoxO3 (0 <= x <= 0.15) have been prepared. The structure, magnetic and transport properties of this system have been systematically investigated. All the samples showed good single phase, and the lattice parameters decreased with the increase of doping concentration x. Only one paramagnetic-ferromagnetic transition was observed. The Curie temperature T-C decreases gradually and the transition width becomes wider with the increase of x. The abnormal transport properties were induced by Co doping, characterized by the double metal-insulator transitions and low-temperature minimum behavior. The present results are discussed and possible explanations were given based on the related theory and previous reported results. (C) 2008 Elsevier B.V. All rights reserved.
引用
收藏
页码：3313 / 3317
页数：5
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