准kagome近藤晶格CeRh $_{1-x}$ Pd $_x$ Sn中4-$f$占位的定量研究
Quantitative investigation of the 4$f$ occupation in the quasikagome Kondo lattice CeRh$_{1-x}$Pd$_x$Sn
摘要：
最近，在由磁阻挫驱动的量子临界性的背景下，讨论了具有在六方平面中形成准kagome晶格的Ce原子的CeRhSn。此外，据报道，Rh被Pd连续取代导致磁有序。本文用硬X射线光电子能谱（HAXPES）研究了CeRh $_{1-x}$ Pd $_x$ Sn对$x$ = 0，0.1，0.3，0.5，0.75取代系列中4个$f$占位的变化。结合全多重峰和组态相互作用分析的核心水平光谱的定量分析表明，随着$x$的上升，由于有效的4 $f$结合能$\varepsilon_{4f}$的增加和有效的杂化$V_\text{eff}$的减少，4 $f^0$的贡献平稳下降。我们进一步比较了价带数据和计算的偏态密度，发现Pd 4PDMATHABMT态比Rh 4PDMATHABMT态离Ce 4PDMATHABMM态在费米能级处远约1 eV.事实上，在芯能级谱的组态相互作用分析中，4个$f$态的有效结合能$\varepsilon_{4f}$降低了相同的量。
英文摘要：
CeRhSn with the Ce atoms forming a quasikagome lattice in the hexagonal plane has recently been discussed in the context of quantum criticality driven by magnetic frustration. Furthermore, it has been reported that the successive substitution of Rh by Pd leads to magnetic order. Here we have investigated the change of the 4$f$ occupation in the substitution series CeRh$_{1-x}$Pd$_x$Sn for for $x$ = 0, 0.1, 0.3, 0.5, 0.75 by means of photoelectron spectroscopy with hard x-rays (HAXPES). The quantitative analysis of the core level spectra with a combined full multiplet and configuration interaction analysis shows a smooth decrease of the 4$f^0$ contribution with rising $x$ due to an increase of the effective 4$f$ binding energy $\varepsilon_{4f}$ and the reduction of the effective hybridization $V_\text{eff}$. We further compare valence band data with the calculated partial density of states and find that the Pd 4$d$ states are about 1eV further away from the Ce 4$f$ states at the Fermi energy than the Rh 4$d$ states. In fact, the effective binding energy $\varepsilon_{4f}$ of the 4$f$ states in the configuration interaction analysis of the core level spectra decreases by the same amount.
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