论文标题
磁场中的非kramer doublet的演变prni $ _2 $ cd $ _ {20} $和prpd $ _2 $ cd $ _ {20} $
Evolution of non-Kramers Doublets in Magnetic Field PrNi$_2$Cd$_{20}$ and PrPd$_2$Cd$_{20}$
论文作者
论文摘要
基于praseodymium的1-2-20笼子化合物Pr $ t_2x_ {20} $（$ t $通常是Ti，v，nb，ru，ru，rh，ir;和$ x $是Al，Zn或cd）提供了另一个平台，可以研究研究非拓扑和磁性命令的非繁琐电子状态，从拓扑和磁性和磁性订单到不可融合的阶级和超级级别的多距离级别和超级固定级别。在本文中，我们报告了两种基于PR的1-2-20材料中电子热容量的测量值：PRNI $ _2 $ CD $ _ {20} $和PRPD $ _2 $ _2 $ cd $ cd $ _ {20} $。我们发现，PR $ 4F^2 $ Valence配置的最低能量多重组为$γ_3$ non-Kramers Doublet，并且假定第一个激发的三重态是磁性$γ_5$。通过分析地面与首次激发单元状态之间在外部磁场上的能量分裂的依赖性，我们发现，与PRPD $ _2 $ _2 $ cd $ _ {20} $中的Schottky异常相对应的最大值与PRNI $ _2 $ _2 $ _2 $ _ {20} $不同，表明了外部磁性领域的linear依赖依据，与PRNI $ _2 $ _2 $ _2 $ _2 $ _2 $ _2 $ _2 $ _2 $ _2 $ _ {20} $相对应。该效果与场诱导的磁偶极矩之间的交换相互作用有关。
Praseodymium-based 1-2-20 cage compounds Pr$T_2X_{20}$ ($T$ is generally Ti, V, Nb, Ru, Rh, Ir; and $X$ is either Al, Zn or Cd) provide yet another platform to study non-trivial electronic states of matter ranging from topological and magnetic orders to unconventional multipolar orders and superconductivity. In this paper, we report measurements of the electronic heat capacity in two Pr-based 1-2-20 materials: PrNi$_2$Cd$_{20}$ and PrPd$_2$Cd$_{20}$. We find that the lowest energy multiplet of the Pr $4f^2$ valence configuration is a $Γ_3$ non-Kramers doublet and the first excited triplet is assumed to be a magnetic $Γ_5$. By analyzing the dependence of the energy splitting between the ground and first excited singlet states on external magnetic field, we found that the maximum in the heat capacity corresponding to the Schottky anomaly in PrPd$_2$Cd$_{20}$, unlike PrNi$_2$Cd$_{20}$, shows pronounced linear dependence on external magnetic field at higher field values. This effect is associated with the exchange interactions between the field-induced magnetic dipole moments.
