Diffse scattering Investigation of magnetic correlations in CsCrMgF6

The modified pyrochlores AM2+M3+F6 (A alkali metal ion, M transition metal ion) are a class of highly frustrated materials that have a randomness associated with the positions of the M2+ and M3+ ions in the lattice, which introduces disorder in both spin and charge degrees of freedom. Recent work has predicted the pattern associated with both spin and charge correlations in the (hhl) plane of these materials, while powder and single crystal neutron diffraction experiments have detected both short and long range magnetic order in various samples. In our sample of CsCrMgF6, we have observed the presence of correlations from our magnetisation data at 100 mK. In light of this, we purpose a diffuse neutron scattering experiment in order to map out the bulk correlations in the (hhl) plane, to determine the nature of the magnetic correlations.

改性焦绿石（pyrochlore）类化合物AM²⁺M³⁺F₆（其中A为碱金属离子（alkali metal ion），M为过渡金属离子（transition metal ion））属于一类高度阻挫材料，其晶格内M²⁺与M³⁺离子的位置存在随机性，该随机性会在自旋与电荷自由度上引入无序性。近期已有研究预测了这类材料在（hhl）散射平面内的自旋与电荷关联模式，而粉末与单晶中子衍射（neutron diffraction）实验已在多种样品中观测到短程与长程磁有序现象。在我们的CsCrMgF₆样品中，通过100 mK下的磁化强度测量数据，我们观测到了关联信号的存在。有鉴于此，我们提议开展一项中子漫散射（diffuse neutron scattering）实验，以测绘出（hhl）平面内的体相关联分布，进而明确磁关联的本质。