Effect of Cu doping at the Mn site on the transport aaand magnetic behaviors of La2/3Ca1/3MnO3

被引：18

作者：

S.L. Yuan

Z.Y. Li

X.Y. Zeng

G.Q. Zhang

F. Tu

G. Peng

J. Liu

Y. Jiang

Y.P. Yang

C.Q. Tang

机构：

[1] Huazhong University of Science and Technology,Department of Physics

来源：

The European Physical Journal B - Condensed Matter and Complex Systems | 2001年 / 20卷 / 2期

关键词：

75.30.Vn Colossal magnetoresistance; 75.30.Kz Magnetic phase boundaries (including magnetic transitions, metamagnetism, etc.); 75.25.+z Spin arrangements in magnetically ordered materials (including neutron and spin-polarized electron studies, synchrotron-source X-ray scattering, etc.);

D O I：

10.1007/BF01315688

中图分类号：

学科分类号：

摘要：

We show that the replacement of Mn with Cu, without any structure change, strongly affects the transport and magnetic behaviors in La2/3Ca1/3 Mn1-xCuxO 3 - δ (x?0.3). Doping largely shifts the insulator-metal transition towards the low-temperature regime and causes substantial enhancements in both resistance and magnetoresistance near the transition for doping range of x? 15%, and further doping to x≥ 20% shows insulating behavior. For 15% doping, the sample shows large magnetoresistances (∼104%) over the whole low temperature range. Magnetization measurement at helium temperature reveals that samples for x? 10% and ≥ 20% basically show ferromagnetic (FM) and antiferromagnetic (AF) behaviors, respectively, while the 15% Cu doped sample undergoes a metamagnetic transition from AF state to FM state on increasing field. We argue that doping introduces the AF insulating phase into the system, causing unusual transport and magnetic behaviors.

引用

页码：177 / 181

页数：4