Influence of the Jahn-Teller distortion on magnetic ordering in TbMn_(1-x)Fe_xO_3  

作　　者：靳金玲 张向群 李国科 成昭华 

机构地区：[1]State Key Laboratory of Magnetism,Institute of Physics,Chinese Academy of Sciences

出　　处：《Chinese Physics B》2012年第10期451-455,共5页中国物理B（英文版）

基　　金：Project supported by the National Basic Research Program of China (Grant Nos. 2010CB934202 and 2011CB921801);the National Natural Science Foundation of China (Grant Nos. 11174351,50931006,51021061,and 11034004)

摘　　要：The Jahn-Teller distortion plays an important role in determining the exchange interaction in rare-earth manganites.In this work we study the influence of the Jahn-Teller distortion on the magnetic structures of TbMn1-xFexO3（x = 0,0.02,0.05,0.10,and 0.20） single crystals in the basal MnO2 plane.The decrease in the quadruple splitting with the increasing Fe doping indicates the reduction of the Jahn-Teller distortion,which makes the nearest neighboring（NN） FM interaction dominant over the next nearest neighbor（NNN） AFM interaction.This alteration is favorable for the development of A-type AFM ordering instead of the spiral magnetic ordering,which collapses when x ≥ 0.05.The analysis of dielectric data indicates that the ferroelectricity is arising from the peculiar spiral magnetic ordering.The Jahn-Teller distortion plays an important role in determining the exchange interaction in rare-earth manganites.In this work we study the influence of the Jahn-Teller distortion on the magnetic structures of TbMn1-xFexO3（x = 0,0.02,0.05,0.10,and 0.20） single crystals in the basal MnO2 plane.The decrease in the quadruple splitting with the increasing Fe doping indicates the reduction of the Jahn-Teller distortion,which makes the nearest neighboring（NN） FM interaction dominant over the next nearest neighbor（NNN） AFM interaction.This alteration is favorable for the development of A-type AFM ordering instead of the spiral magnetic ordering,which collapses when x ≥ 0.05.The analysis of dielectric data indicates that the ferroelectricity is arising from the peculiar spiral magnetic ordering.

关 键 词：quadruple splitting Jahn-Teller distortion spiral magnetic ordering 

分 类 号：TM27[一般工业技术—材料科学与工程] O614.711[电气工程—电工理论与新技术]