Composition- and temperature-dependent magnetic structures of the layered manganites La2-2xSr1+2xMn2O7 (x=0.35 and 0.4)

被引:0
|
作者
Choi, YH [1 ]
Kim, SH
Kwon, YU
Lee, CH
Lee, JS
Shim, HS
机构
[1] Sungkyunkwan Univ, Dept Chem, Suwon 440746, South Korea
[2] Sungkyunkwan Univ, Sch Mol Sci BK 21, Suwon 440746, South Korea
[3] Korea Atom Energy Res Inst, Taejon 305600, South Korea
关键词
layered manganites; magnetic structure; crystal structure; neutron diffraction;
D O I
暂无
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
Temperature-dependent neutron diffraction studies were performed on the ferromagnetic layered manganites La2-2xSr1+2xMn2O7 (x = 0.35 and 0.4), and,the detailed temperature variations of the crystal and the magnetic structures are reported. The ferromagnetic Mn-spins had temperature-dependent orientations. The spins were tilted towards the c-axis of the tetragonal unit cell, perpendicular to the perovskite layer at the onset of the ferromagnetic state and as the temperature was lowered gradually rotated to the ab-plane to tilting angles (theta) against the c-axis of 62(l)degrees and 65(2)degrees for the x = 0.35 and 0.4 compounds, respectively. A simple model based on crystal field theory is proposed to explain the variation of the tilting angle with the composition and the temperature of the compounds with 0.30<x<0.4.
引用
收藏
页码:522 / 527
页数:6
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