Electrical and Magnetic Properties of Bilayer Manganites La_(1.4)Sr_(1.6)Mn_(1.96)TE_(0.04)O_7 (TE=Mn, Fe, Ti, Nb)  

作　　者：余功奇 袁松柳 任光明 缪菊红 肖循 王永强 

机构地区：[1]Department of Physics, Huazhong University of Science and Technology

出　　处：《Journal of Rare Earths》2007年第4期439-443,共5页稀土学报（英文版）

基　　金：Project supported by the National "973" Project (2006CB921606 );National Natural Science Foundation of China(10574049);Foundation from the Ministry of the National Education (20060487011)

摘　　要：The electrical and magnetic properties of bilayer manganites La1.4Sr1.6Mn1.96TE0.04O7（TE = Mn, Fe, Ti, Nb） were investigated. Doping caused obvious changes in electrical and magnetic behaviors such as decrease of insulator-metal transition and magnetic transition temperatures, increase of peak resistivity, and different magnetoresistance effect. These changes had a significant degree of correlation with the valence of doped ions. From Fe, Ti to Nb doping, the effect was doubly stronger. The results could be well understood by considering the different destructions on double-exchange interaction and different influences on lattice distortion caused by Fe, Ti and Nb doping. The temperature dependence of magnetization measured at high field showed that the influence of doping was greatest near three-dimensional magnetic transition temperature of parent phase.The electrical and magnetic properties of bilayer manganites La1.4Sr1.6Mn1.96TE0.04O7（TE = Mn, Fe, Ti, Nb） were investigated. Doping caused obvious changes in electrical and magnetic behaviors such as decrease of insulator-metal transition and magnetic transition temperatures, increase of peak resistivity, and different magnetoresistance effect. These changes had a significant degree of correlation with the valence of doped ions. From Fe, Ti to Nb doping, the effect was doubly stronger. The results could be well understood by considering the different destructions on double-exchange interaction and different influences on lattice distortion caused by Fe, Ti and Nb doping. The temperature dependence of magnetization measured at high field showed that the influence of doping was greatest near three-dimensional magnetic transition temperature of parent phase.

关 键 词：bilayer manganites DOUBLE-EXCHANGE transition temperature MAGNETORESISTANCE rare earths 

分 类 号：TM271[一般工业技术—材料科学与工程]