Fabrykiewicz Piotr, Przeniosło Radosław, Sosnowska Izabela
Faculty of Physics, University of Warsaw, Pasteura 5, 02-093 Warsaw, Poland.
Acta Crystallogr A Found Adv. 2021 Mar 1;77(Pt 2):160-172. doi: 10.1107/S205327332100111X.
A classification of magnetic superspace groups compatible with the helical and cycloidal magnetic modulations is presented. Helical modulations are compatible with groups from crystal classes 1, 2, 222, 4, 422, 3, 32, 6 and 622, while cycloidal modulations are compatible with groups from crystal classes 1, 2, m and mm2. For each magnetic crystal class, the directions of the symmetry-allowed (non-modulated) net ferromagnetic moment and electric polarization are given. The proposed classification of superspace groups is tested on experimental studies of type-II multiferroics published in the literature.
本文提出了一种与螺旋和摆线磁调制兼容的磁超空间群分类。螺旋调制与晶体学点群1、2、222、4、422、3、32、6和622中的群兼容，而摆线调制与晶体学点群1、2、m和mm2中的群兼容。对于每个磁晶体类，给出了对称允许的（非调制的）净铁磁矩和电极化方向。所提出的超空间群分类在文献中发表的II型多铁性材料的实验研究中得到了验证。
