Magnetic and transport properties of Dy substituted layered perovskite La_(1.3)Sr_(1.7)Mn_2O_7  

作　　者：郑琳 鲁毅 赵建军 张向群 邢茹 吴鸿业 金香 周敏 成昭华 

机构地区：[1]Department of Physics,Baotou Normal University [2]State Key Laboratory of Magnetism and Beijing National Laboratory for Condensed Matter Physics,Institute of Physics,Chinese Academy of Sciences

出　　处：《Chinese Physics B》2010年第12期495-498,共4页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundation of China (Grant No. 50862007);the Inner Mongolia Natural Science Foundation of China (Grant No. 2009MS0101)

摘　　要：The effect of Dy substitution for La site in layered manganese oxides La1.3-xDyxSr1.7Mn2O7 on the magnetic and electrical properties has been investigated. With the La3＋ substituting by Dy^3＋, the long range three-dimensional ferromagnetism transition and the insulator-metal transition disappear. These effects are attributed to the lattice distortion due to the substitution of the smaller Dy^3＋. Addtionally, the small Dy^3＋ is inclined to occupy the R site which is in the rock-salt layer, then the distribution of La, Sr, Dy ions in Dy-doped sample should be more orderly than that in Lal.3Sr1.7Mn2O7, so there is only one insulator-metal transition in the ρ-T curve of the sample with x = 0.05 and x = 0.1.The effect of Dy substitution for La site in layered manganese oxides La1.3-xDyxSr1.7Mn2O7 on the magnetic and electrical properties has been investigated. With the La3＋ substituting by Dy^3＋, the long range three-dimensional ferromagnetism transition and the insulator-metal transition disappear. These effects are attributed to the lattice distortion due to the substitution of the smaller Dy^3＋. Addtionally, the small Dy^3＋ is inclined to occupy the R site which is in the rock-salt layer, then the distribution of La, Sr, Dy ions in Dy-doped sample should be more orderly than that in Lal.3Sr1.7Mn2O7, so there is only one insulator-metal transition in the ρ-T curve of the sample with x = 0.05 and x = 0.1.

关 键 词：magnetic property electrical property MAGNETORESISTANCE metal-insulator transition 

分 类 号：O482.5[理学—固体物理]