Title: Structural Trends and Itinerant Magnetism of the New Cage-structured Compound HfMn$_{2}$Zn$_{20}$ Show Chinese title

Title: 新型笼状结构化合物HfMn$_{2}$Zn$_{20}$的结构趋势和巡游磁性

Abstract: A new cage-structured compound - HfMn$_{2}$Zn$_{20}$ - belonging to the AB$_{2}$C$_{20}$ (A, B = transition or rare earth metals, and C = Al, Zn, or Cd) family of structures has been synthesized via the self-flux method. The new compound crystallizes in the space group Fd-3m with lattice parameter a = 14.0543(2) \r{A} (Z = 8) and exhibits non-stoichiometry due to Mn/Zn mixing on the Mn-site and an underoccupied Hf-site. The structure refines to Hf$_{0.93}$Mn$_{1.63}$Zn$_{20.37}$ and follows lattice size trends when compared to other HfM$_{2}$Zn$_{20}$ (M = Fe, Co, and Ni) structures. The magnetic measurements show that this compound displays a modified Curie-Weiss behavior with a transition temperature around 22 K. The magnetization shows no saturation, a small magnetic moment, and near negligible hysteresis, all signs of the itinerant magnetism. The Rhodes-Wohlfarth ratio and the spin fluctuation parameters ratio both confirm the itinerant nature of the magnetism in HfMn$_{2}$Zn$_{20}$. Show Chinese abstract

Abstract: 一种新的笼状结构化合物 - HfMn$_{2}$Zn$_{20}$ - 属于 AB$_{2}$C$_{20}$ (A, B = 过渡金属或稀土金属，C = Al, Zn 或 Cd) 结构家族，已通过自熔剂法合成。 这种新化合物结晶在空间群 Fd-3m 中，晶格参数 a = 14.0543(2) Å（Z = 8），由于 Mn 位点上的 Mn/Zn 混合和 Hf 位点的空缺而表现出非化学计量性。 结构细化为Hf$_{0.93}$Mn$_{1.63}$Zn$_{20.37}$并且与其它HfM$_{2}$Zn$_{20}$ (M = Fe, Co, and Ni) 结构相比遵循晶格尺寸趋势。 磁性测量显示，该化合物表现出修改的居里-韦斯行为，转变温度约为22 K。磁化强度没有饱和，磁矩较小，磁滞几乎可以忽略，这些都是巡游磁性的迹象。 Rhodes-Wohlfarth比值和自旋涨落参数比值都证实了HfMn$_{2}$Zn$_{20}$中磁性的巡游特性。