论文标题
在基于CE的Cage化合物中消失的Rkky相互作用
Vanishing RKKY interactions in Ce-based cage compounds
论文作者
论文摘要
我们报告了基于立方CE的笼子化合物CE $ t_ {2} $ cd $ _ {20} $（$ t $ = ni，pd）的外部磁场中热力学测量结果。我们对热容量数据数据的分析表明，$γ_7$ doublet是CE $^{3+} $ ions的基态多重。因此，对于$γ_7$ double，可以证明，鲁德曼 - 凯特尔 - 卡苏亚 - 耶西达（Rkky）（rkky）之间的相互作用是由传导电子介导的局部CE矩之间必须在温度下消失的温度远低于首先兴奋的基础状态双打的能量，而不是首先兴奋的$γ_8$γ_8$γ_8$ quartet。我们的发现提供了有关为什么在Millikelvin范围内的温度下，在这些化合物中未观察到的远距离顺序的见解。
We report the results of thermodynamic measurements in external magnetic field of the cubic Ce-based cage compounds Ce$T_{2}$Cd$_{20}$ ($T$ = Ni,Pd). Our analysis of the heat-capacity data shows that the $Γ_7$ doublet is the ground state multiplet of the Ce$^{3+}$ ions. Consequently, for the $Γ_7$ doublet it can be theoretically shown that the Ruderman-Kittel-Kasuya-Yosida (RKKY) interaction between the localized Ce moments mediated by the conduction electrons, must vanish at temperatures much lower than the energy separating the ground state doublet from the first excited $Γ_8$ quartet. Our findings provide an insight as to why no long range order has been observed in these compounds down to temperatures in the millikelvin range.
