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CeRhSn with the Ce atoms forming a quasikagome lattice in the hexagonal planehas recently been discussed in the context of quantum criticality driven bymagnetic frustration. Furthermore, it has been reported that the successivesubstitution of Rh by Pd leads to magnetic order. Here we have investigated thechange of the 4$f$ occupation in the substitution series CeRh$_{1-x}$Pd$_x$Snfor for $x$ = 0, 0.1, 0.3, 0.5, 0.75 by means of photoelectron spectroscopywith hard x-rays (HAXPES). The quantitative analysis of the core level spectrawith a combined full multiplet and configuration interaction analysis shows asmooth decrease of the 4$f^0$ contribution with rising $x$ due to an increaseof the effective 4$f$ binding energy $\varepsilon_{4f}$ and the reduction ofthe effective hybridization $V_\text{eff}$. We further compare valence banddata 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 energythan the Rh 4$d$ states. In fact, the effective binding energy$\varepsilon_{4f}$ of the 4$f$ states in the configuration interaction analysisof the core level spectra decreases by the same amount.

Quantitative investigation of the 4$f$ occupation in the quasikagome Kondo lattice CeRh$_{1-x}$Pd$_x$Sn