Influence of annealing atmosphere on the properties of La0.5Sr0.5MnO3

被引：10
|
作者：
Shi, Lei [1 ]
Yang, Haipeng [1 ]
Zhou, Shiming [1 ]
Zhao, Jiyin [1 ]
He, Laifa [1 ]
Zhao, Shuangyi [1 ]
Guo, Yuqiao [1 ]
Chen, Lin [1 ]
机构：
[1] Univ Sci & Technol China, Hefei Natl Lab Phys Sci Microscale, Hefei 230026, Anhui, Peoples R China
来源：
SOLID STATE COMMUNICATIONS | 2010年 / 150卷 / 7-8期
基金：
美国国家科学基金会;
关键词：
Manganites; Annealing atmosphere; Magnetism; Resistivity; GIANT MAGNETORESISTANCE; DEFECT CHEMISTRY; PHASE-SEPARATION; NONSTOICHIOMETRY; LAMNO3+/-DELTA; LAMNO3+DELTA; LA1-XSRXMNO3; TRANSITION; BEHAVIOR; SR;
D O I：
10.1016/j.ssc.2009.11.047
中图分类号：
O469 [凝聚态物理学];
学科分类号：
070205 ;
摘要：
The structure, magnetic and electrical transport properties of La0.5Sr0.5MnO3 annealed in different atmosphere have been investigated. No evident change of structural symmetry and the Curie temperature is observed for the samples. The resistivity at zero magnetic field of the samples annealed in air and nitrogen exhibits a metal-insulator transition, while no metal-insulator transition is observed for the sample annealed in oxygen, and for which the resistivity decreases monotonously with increasing temperature. Surprisingly, when an external magnetic field is applied, a metal-insulator transition appears for the sample annealed in oxygen. It is suggested that the annealing atmosphere affects the competition between FM and AFM phases due to the change of Mn4+/Mn3+ ratio and the oxygen/cation vacancies, and has a great influence on the electrical transport properties of La0.5Sr0.5MnO3. (C) 2009 Elsevier Ltd. All rights reserved.
引用
收藏
页码：371 / 374
页数：4
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