Anomalous magnetic behavior for Mn-site doped La0.7Ca0.3MnO3: internal magnetic interactions and extrinsic inhomogeneity

被引：2

作者：

Zhang, Hong-guang ^{[1
]}

Li, Yong-tao ^{[1
]}

Xie, Liang ^{[3
]}

Shi, Jiang-jian ^{[2
]}

Dong, Xue-guang ^{[2
]}

Ge, Xiao-peng ^{[2
]}

Liu, Hao ^{[2
]}

Li, Qi ^{[2
]}

机构：

[1] Nanjing Univ Posts & Telecommun, Coll Sci, Nanjing 210046, Jiangsu, Peoples R China

[2] Southeast Univ, Dept Phys, Nanjing 211189, Jiangsu, Peoples R China

[3] North China Univ Technol, Dept Phys & Chem Sci, Beijing 100144, Peoples R China

来源：

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 2015年 / 393卷

基金：

中国国家自然科学基金;

关键词：

Manganites; Colossal magnetoresistance; Magnetic behavior; Ising model; GIANT MAGNETORESISTANCE; TRANSITION; PEROVSKITES; PHASE; FILMS; CA;

D O I：

10.1016/j.jmmm.2015.05.045

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Magnetic properties of Mn-site doped La0.7Ca0.3Mn0.94TM0.06O3+Delta (TM=Cu, Zn) were experimentally and theoretically studied. The low temperature magnetization and magnetic phase transition temperature T-C of the samples combining with simulations of 2D doped Ising model suggest that Cu2+ ions have an antiferromagnetic interaction with their nearest neighboring Mn ions. Interestingly, an anomalous magnetic behavior, a "step-like" magnetic phase transition, is observed. The existence and magnitude of this step vary with different doping ions and oxygen ratio, which is experimentally suggested to be relevant to the interaction between magnetic ions and oxygen content. A superposition between two independent magnetic systems with different values of an exchange integral J well explains the anomalous magnetic phase transition, which suggests that this step-like behavior results from extrinsic in homogeneity and negligible coupling between grains in polycrystalline. (C) 2015 Elsevier B.V. All rights reserved.

引用

页码：62 / 66

页数：5

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