Magnetic and electric properties of layered perovskites Nd2-2xSr1+2xMn2O7 (x = 0.3-0.5)

被引：8

作者：

Zhang, J ^{[1
]}

Wang, FW ^{[1
]}

Zhang, PL ^{[1
]}

Sun, XD ^{[1
]}

Yan, QW ^{[1
]}

机构：

[1] Chinese Acad Sci, Inst Phys, State Key Lab Magnet, Beijing 100080, Peoples R China

来源：

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 1998年 / 190卷 / 03期

关键词：

magnetic and electric properties; layered perovskites; magnetoresistance effect; double-exchange; super-exchange;

D O I：

10.1016/S0304-8853(98)00286-8

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Magnetic and electric properties of layered perovskites Nd2 - 2xSr1 + 2xMn2O7 (x = 0.3, 0.4 and 0.5) are sensitive to the doping content x. The sample with x = 0.5 is antiferromagnetic (AFM) and insulating. On decreasing x, the AFM ordering is suppressed and a canted AFM or weak ferromagnetic (FM) ordering appears, and the resistivity decreases. The sample with x = 0.4 still shows insulating behavior, but a metal-insulator transition is observed for x = 0.3. By suggesting the presence of a competition between AFM super-exchange interaction and FM double-exchange interaction, the doping dependence of magnetic and electric properties can be understood. (C) 1998 Elsevier Science B.V. All rights reserved.

引用

页码：166 / 170

页数：5

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