Origin of large magneto-electric effect in multiferroic compound RMn2O5

本研究的目的是通过磁性和晶体结构分析来揭示多铁性化合物RMn_2O_5中大磁电效应的起源。为了进行这项研究，我们开发了高压中子磁结构分析技术和使用同步辐射X射线的超精确晶体结构分析。此外，我们开发了一个大型的二维中子探测器（2DPSD）进行快速和有效的中子实验。结果发现了伴随铁电相的新型磁结构。此外，我们还确定了YMn_2O_5铁电相的空间群。

The purpose of the present study is to reveal the origin of the large magneto-electric effect in multiferroic compounds RMn2O5 using magnetic and crystal structure analysis. In order to perform this investigation, we developed the technique of high-pressure neutron magnetic structure analysis and the super accurate crystal structure analysis using synchrotron x-ray. Furthermore, we developed a large two-dimensional neutron detector (2DPSD)to perform rapid and effective neutron experiments. As a result, we have discovered new type magnetic structure accompanied by the ferroelectric phase. In addition, we determined the space group of the ferroelectric phase of YMn2O5.