La_(2/3)Ca_(1/3)Mn_(1-x)Fe_xO_3电磁输运性质和电子自旋共振谱的研究  

THE ELECTROMAGNETIC TRANSPORT TRANSPORT PROPERTIES AND ELECTRON ELECTRON SPIN RESONANCE SPECTROSCOPY OF La_(2/3)Ca_(1/3)Mn_(1-x)Fe_xO_3

作　　者：郑庆华[1,2] 蒋正龙[2] 赵旺[1] 童悦[1] 

机构地区：[1]淮南师范学院物理与电子信息系,安徽淮南232001 [2]中国科学技术大学合肥微尺度物质科学国家实验室,合肥230026

出　　处：《低温物理学报》2014年第3期185-189,共5页Low Temperature Physical Letters

基　　金：国家自然科学基金项目(批准号:61205213);安徽省教育厅自然科学基金项目(批准号:KJ2011B160;KJ2012Z384)资助的课题~~

摘　　要：用固相合成法制备了La2/3Ca1/3Mn1-xFexO3(x=0、0.1、0.2)材料,通过X射线衍射、磁化强度-温度曲线、电子自旋共振谱线,研究了Fe替代部分的Mn对La2/3Ca1/3Mn1-xFexO3电磁性质的影响.结果表明:Fe离子掺杂对晶体结构影响较小;对电磁输运性质和磁结构影响较大,体系在低温区域较宽的温度范围内显示出巨磁电阻效应;ESR的测量结果也表明Fe离子掺杂形成反铁磁的交换作用,阻塞了铁磁Mn3+-O-Mn4+双交换通道,降低了体系的铁磁性.La2/3 Cal/3 Mn1- x FexO3 （x = 0, 0. 1, 0. 2） materials are perpared by solid preparation method. X-ray diffraction, magnetization temperature curve and electron spin resonance spectrum line are employed to investigate the electromagnetic properties of Mn substitution part of Fe in La2/3 Cal/3 Mn1- x FexO3 . The results show that the Fe ion doping plays little effects on the crystal structure; and induce a huge influence on the transport property of electromagnetic and magnetic structure. The system in the low temperature range shows a giant magnetoresistance effect; The ESR measurement result also suggests that Fe ion doping blocked the ferromagnetic double exchange channels between Mn^3＋-O- Mn^4 ＋ , formed the antiferromagnetic exchange action, and the ferromagnetism of the system becoming the weak.

关 键 词：晶体结构 电磁输运特性 巨磁阻效应 ESR谱 

分 类 号：O469[理学—凝聚态物理]