解决尖晶石FeCr2S4中的结构变化和对称性降低
Resolving structural changes and symmetry lowering in spinel FeCr2S4
摘要：
立方尖晶石FeCr_2S_4由于其新出现的晶相以及自旋、轨道和晶格自由度的相互作用而受到广泛的关注。尽管进行了深入的研究，但仍有几个基本问题有待回答，例如在不同的磁性和轨道有序相中细化晶体结构。在这里，使用高分辨率的同步粉末衍射的化学计量的晶体的FeCr 2S 4，我们解决了长期追求的立方到四角的转变在~65 K，减少晶格对称性I41/amd。随着温度的进一步降低，在~9 K，晶体结构变成极性，因此化合物变成多铁性。整个不同阶段的FeCr 2S 4的晶格对称性的阐明提供了理解这个神秘的系统的基础，也突出了相关材料的结构变形的重要性。
英文摘要：
The cubic spinel FeCr2S4 has been receiving immense research interest because of its emergent phases and the interplay of spin, orbital and lattice degrees of freedom. Despite the intense research, several fundamental questions are yet to be answered, such as the refinement of the crystal structure in the different magnetic and orbital ordered phases. Here, using high-resolution synchrotron powder diffraction on stoichiometric crystals of FeCr2S4 we resolved the long sought-after cubic to tetragonal transition at ~65 K, reducing the lattice symmetry to I41/amd. With further lowering the temperature, at ~9 K, the crystal structure becomes polar, hence the compound becomes multiferroic. The elucidation of the lattice symmetry throughout different phases of FeCr2S4 provides a basis for the understanding this enigmatic system and also highlights the importance of structural deformation in correlated materials.
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