Zobkalo I A, Gavrilov S V, Sazonov A, Hutanu V
B.P. Konstantinov Petersburg Nuclear Physics Institute, NRC Kurchatov Institute, Gatchina, 188300, Russia. Saint-Petersburg State University, Saint-Petersburg, 199034, Russia.
J Phys Condens Matter. 2018 May 23;30(20):205804. doi: 10.1088/1361-648X/aabdf6. Epub 2018 Apr 13.
In order to make a new approach to the elucidation of the microscopic mechanisms of multiferroicity in the RMnO family, experiments with different methods of polarized neutrons scattering were performed on a TbMnO single crystal. We employed three different techniques of polarized neutron diffraction without the analysis after scattering, the XYZ-polarization analysis, and technique of spherical neutron polarimetry (SNP). Measurements with SNP were undertaken both with and without external electric field. A characteristic difference in the population of 'right' and 'left' helix domains in all magnetically ordered phases of TbMnO, was observed. This difference can be controlled by an external electric field in the field-cooled mode. The analysis of the results gives an evidence that antisymmetric Dzyaloshinsky-Moria exchange is effective in all the magnetic phases in TbMnO.
为了找到一种新方法来阐明RMnO族中多铁性的微观机制，我们对TbMnO单晶进行了不同偏振中子散射方法的实验。我们采用了三种不同的偏振中子衍射技术，分别是散射后不进行分析的方法、XYZ偏振分析以及球形中子极化测量技术（SNP）。使用SNP进行测量时，分别在有和没有外部电场的情况下进行。在TbMnO的所有磁有序相中，均观察到“右”螺旋畴和“左”螺旋畴数量上的特征差异。这种差异可以通过场冷模式下的外部电场来控制。结果分析表明，反对称的Dzyaloshinsky-Moria交换在TbMnO的所有磁相中均有效。
