Influence of the Jahn-Teller distortion on magnetic ordering in TbMn1-xFexO3

• Published in: 中国物理B：英文版 2012-10, Vol.21 (10), p.451-455
• Main Author: 靳金玲 张向群 李国科 成昭华
• Format: Article
• Language: English
• Subjects: AFM; Jahn-Teller畸变; 原子力显微镜; 四极分裂; 相互作用; 磁有序; 磁结构; 稀土锰氧化物
• ISSN: 1674-1056; 2058-3834
• DOI: 10.1088/1674-1056/21/10/107501

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.