Magnetic and electrical transport properties of the pyrochlore iridate Bi2-xCoxIr2O7

被引：7
|
作者：
Feng, Yuan [1 ]
Zhu, Shoujin [2 ]
Bian, Jian [1 ]
Chen, Feng [1 ]
Chen, Shiyun [3 ]
Ma, Cuiling [4 ]
Liu, Hui [1 ]
Fang, Baolong [1 ]
机构：
[1] Hefei Univ, Dept Math & Phys, Hefei 230601, Anhui, Peoples R China
[2] Sanlian Univ, Hefei 230601, Anhui, Peoples R China
[3] Hefei Univ, Analyt & Testing Ctr, Hefei 230601, Anhui, Peoples R China
[4] Hefei Univ, Dept Architecture & Civil Engn, Hefei 230601, Anhui, Peoples R China
来源：
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 2018年 / 451卷
关键词：
Pyrochlore iridate; Frustrated magnetism; Grain boundary effects; Electron-electron scattering; RKKY INTERACTION; SYSTEMS;
D O I：
10.1016/j.jmmm.2017.11.071
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
In the present paper, we have studied the magnetic order and electrical transport properties of frustrated magnet Bi2-xCoxIr2O7 (x = 0, 0.2, 0.4, 0.6) polycrystalline. The behavior of the electrical resistivity above 50 K in the composites emanate from the electron-electron scattering processes. Grain boundary effects play a dominant role in the conduction process. It is also found from M-T data that the antiferromagnetic interaction and frustration enhances with increasing content of Co. Effective magnetic moments show a possibility of mixed valence state of Co (Co3+ and Co4+). The M-H data of doped samples taken at 2 K show hysteresis loops, which suggests the existence of ferromagnetic interaction originated from canted antiferromagnetic state. The magnetic behavior results from the competition between ferromagnetic and antiferromagnetic interaction at each magnetic site. (C) 2017 Elsevier B.V. All rights reserved.
引用
收藏
页码：283 / 287
页数：5
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