论文标题
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
论文作者
论文摘要
Cutic尖晶石FECR2S4由于其新兴阶段以及旋转，轨道和晶格自由度的相互作用而引起了巨大的研究兴趣。尽管进行了激烈的研究，但尚未回答几个基本问题，例如在不同的磁性和轨道有序阶段对晶体结构的完善。在这里，使用FECR2S4的化学计量晶体上的高分辨率同步粉末衍射，我们在〜65 K时解决了长期抢手的立方体到四方过渡，将晶格对称性降低到I41/AMD。随着进一步降低温度，在〜9 K时，晶体结构变为极性，因此化合物变成多效。在FECR2S4的不同阶段，阐明了晶格对称性，为理解这种神秘的系统提供了一个基础，并突出了相关材料中结构变形的重要性。
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.
