论文标题
kagome晶格中的电荷密度波金属间SCV6SN6
Charge density wave in kagome lattice intermetallic ScV6Sn6
论文作者
论文摘要
托有kagome晶格的材料引起了对几何挫败感产生的多种磁性和电子状态的兴趣。在$ a $ v $ _3 $ sb $ _5 $化合物（$ a $ = k，rb，cs）中，堆叠的钒kagome层产生了异常的电荷密度波（CDW）和超导性。在这里，我们报告了SCV $ _6 $ SN $ _6 $的单晶增长和特征，A Hexagonal HFFE $ _6 $ ge $ _6 $ type化合物，共享该结构图案。我们在92 K处确定一阶相变。单晶X射线和中子衍射揭示了低于该温度的原子晶格的电荷密度波调制。这是一种与$ a $ v $ _3 $ _3 $ sb $ _5 $化合物中观察到的结构模式截然不同的模式，但是预计在kagome金属中都会有这两种模式。多样化的hffe $ _6 $ ge $ _6 $ family提供了更多的机会来调整SCV $ _6 $ sn $ _6 $，并在Kagome晶格材料中探索密度波订单。
Materials hosting kagome lattices have drawn interest for the diverse magnetic and electronic states generated by geometric frustration. In the $A$V$_3$Sb$_5$ compounds ($A$ = K, Rb, Cs), stacked vanadium kagome layers give rise to unusual charge density waves (CDW) and superconductivity. Here we report single-crystal growth and characterization of ScV$_6$Sn$_6$, a hexagonal HfFe$_6$Ge$_6$-type compound that shares this structural motif. We identify a first-order phase transition at 92 K. Single crystal X-ray and neutron diffraction reveal a charge density wave modulation of the atomic lattice below this temperature. This is a distinctly different structural mode than that observed in the $A$V$_3$Sb$_5$ compounds, but both modes have been anticipated in kagome metals. The diverse HfFe$_6$Ge$_6$ family offers more opportunities to tune ScV$_6$Sn$_6$ and explore density wave order in kagome lattice materials.
