Vanishing RKKY interactions in Ce-based cage compounds
Vanishing RKKY interactions in Ce-based cage compounds
复制标题
Ce基笼状化合物中RKKY相互作用的消失
DOI：
10.1088/1361-648x/acf019
复制
发表时间：
2023
期刊：
影响因子：
--
通讯作者：
Dzero, M.
中科院分区：
文献类型：
--
作者：
Konic, A. M.;Zhu, Y.;Breindel, A. J.;Deng, Y.;Moir, C. M.;Maple, M. B.;Almasan, C. C.;Dzero, M.
报道了立方Ce基笼状化合物CeT2CD20(T=Ni，Pd)的外磁场热力学测量结果。我们对热容数据的分析表明，Γ7二重态是Ce3+离子的基态多重态。因此，对于Γ7二重态，理论上可以证明传导电子介导的局域Ce力矩之间的Ruderman-Kittel-Kasuya-Yosida相互作用必须在远低于基态二重态与第一激发Γ8四重态之间的能量的温度下消失。我们的发现提供了一个洞察力，为什么在这些化合物中没有观察到低至毫开尔文范围的温度的长程有序。
We report the results of thermodynamic measurements in external magnetic field of the cubic Ce-based cage compounds CeT 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 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.