复合体系Ag_δLa_(0.60)Sr_(0.40-x)Ag_(x-δ)MnO_3的磁电阻效应  

On the Magnetoresistance in Ag_δLa_(0.60)Sr_(0.40-x)Ag_(x-δ)MnO_3

作　　者：赵福伟[1] 丁冬[2] 唐贵德[3] 李珉[1] 裴祥喜[1] 

机构地区：[1]河北工程技术高等专科学校教务处,河北沧州061001 [2]华北科技学院基础部,河北廊坊101601 [3]河北师范大学物理科学与信息工程学院,河北石家庄050024

出　　处：《河北师范大学学报（自然科学版）》2012年第5期473-477,共5页Journal of Hebei Normal University：Natural Science

基　　金：河北省自然科学基金(E2011205083);河北省基础研究重点项目(10965125D)

摘　　要：采用溶胶-凝胶法(sol-gel)制备了名义组分为AgδLa0.60Sr0.40-xAgx-δMnO3的多晶样品.研究发现,用Ag+替代Sr2+后,样品的居里温度降至室温附近,并且室温磁电阻比替代前明显增大.在1.8T的磁场下,x=0.30的样品在289K时,Rm=17.0%,因此提高了室温时样品的磁电阻.The polycrystalline samples AgδLa0.60Sr0.40-xAgx-δMnO3were synthesized by sol-gel method.It was found that when Sr2＋ ions were partly substituted by Ag＋ ions,the Curie temperature of substituted samples decreased to room temperature and the room temperature magnetoresistance（MR） increased obviously than un-substituted La0.60Sr0.40MnO3.Under an applied filed of 1.8 T,there was a maximum MR with 17 % at 289 K for the sample with x=0.30.Therefore the room temperature magnetoresistance were highly improved.

关 键 词：钙钛矿锰氧化物 磁电阻 溶胶-凝胶法 

分 类 号：O482.5[理学—固体物理]