Helical screw type magnetic structure of the multiferroic CaMn7O12 with low Cu-doping

被引：24
|
作者：
Slawinski, W. [1 ]
Przenioslo, R. [1 ]
Sosnowska, I. [1 ]
Petricek, V. [2 ]
机构：
[1] Univ Warsaw, Inst Expt Phys, PL-00681 Warsaw, Poland
[2] Acad Sci Czech Republ, Inst Phys, Vvi, Prague 18221 8, Czech Republic
来源：
ACTA CRYSTALLOGRAPHICA SECTION B-STRUCTURAL SCIENCE CRYSTAL ENGINEERING AND MATERIALS | 2012年 / 68卷
关键词：
SUPERSPACE GROUPS; PEROVSKITE;
D O I：
10.1107/S0108768112008038
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
The modulated crystal structure and modulated magnetic ordering of the multiferroic CaCuxMn7-xO12 is studied by analysing neutron and synchrotron-radiation (SR) powder diffraction data with a model based on the magnetic super-space group R31'(00 gamma)ts. Both atomic position modulations and magnetic modulations are described with the modulation vector (0, 0, q). The magnetic ordering is a screw-type circular helix where the magnetic moments are perpendicular to the c direction. The temperature dependence of the modulation vector length and the ordered magnetic moments of Mn3+ and Mn4+ ions is given between T = 50 K and the Neel temperature T-N similar or equal to 90 K. The atomic position modulation length L-p and the magnetic modulation length L-m fulfil the relation L-m = 2L(p) at all temperatures between 50 K and T-N.
引用
收藏
页码：240 / 249
页数：10
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