稀土氧硫化物RE₂O₂S作为模型混合阴离子阻挫磁体
Rare-earth oxysulfides RE$_2$O$_2$S as model mixed-anion frustrated magnets
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中文总结 AI 辅助
该研究合成表征了一类具有三角双层晶格的稀土氧硫化物反铁磁体，发现其存在层间结构无序，凸显了稀土基混合阴离子材料阻挫磁基态的可调控性及彻底结构表征的重要性。
中文摘要 AI 辅助
低维与各向异性磁性的研究是发现新奇量子现象的有前景途径。混合阴离子材料（定义为金属阳离子由两种或更多不同阴离子配位）为调控结构、磁性和电子性质提供了本征各向异性平台。本研究合成并表征了一类具有三角双层平板晶格几何的稀土氧硫化物（RE₂O₂S）反铁磁体（AFM），多数组分观察到长程AFM有序，其中RE为Ce、Pr、Nd、Sm的几种此前未被报道。尽管被认为符合化学计量比，但对Nd组分的 pair distribution function（PDF）分析提供了显著的、依赖合成的层间结构无序（RE₂O₂₊ₓS₁₋ₓ）的证据，导致其体磁响应存在显著变异性。本研究凸显了稀土基混合阴离子材料中阻挫磁基态的可调控性，以及在发现新型混合阴离子磁体时进行彻底结构表征的重要性。
英文摘要
The study of low-dimensional and anisotropic magnetism is a promising avenue for the discovery of novel quantum phenomena. Mixed-anion materials, defined by the coordination of metal cations by two or more distinct anionic species, provide an intrinsically anisotropic platform for the tuning of structural, magnetic, and electronic properties. In this work, we report the synthesis and characterization of a family of rare-earth oxysulfide (RE$_2$O$_2$S) antiferromagnets (AFM) possessing a triangular-bilayer slab lattice geometry. Long-range AFM order is observed for the majority of compositions, with several (RE = Ce, Pr, Nd, Sm) having been previously unreported. Although assumed to form stoichiometrically, pair distribution function (PDF) analysis provides evidence for significant, synthesis-dependent interslab structural disorder as RE$_2$O$_{2+x}$S$_{1-x}$, resulting in significant variability in the bulk magnetic response of the Nd member. This work highlights the tunability of frustrated magnetic ground states in rare-earth-based mixed-anion materials, and the importance of thorough structural characterization in the discovery of new mixed-anion magnets.
