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Starting with the heavy fermion compound CeNi$_9$Ge$_4$, the substitution ofnickel by copper leads to a dominance of the RKKY interaction in competitionwith the Kondo and crystal field interaction. Consequently, this results in anantiferromagnetic phase transition in CeNi$_{9-x}$Cu$_x$Ge$_4$ for $x>0.4$,which is, however, not fully completed up to a Cu-concentration of $x=1$. Tostudy the influence of single-ion effects on the AFM ordering by shielding the$4f$-moments, we analyzed the spin diluted substitution seriesLa$_{0.5}$Ce$_{0.5}$Ni$_{9-x}$Cu$_x$Ge$_4$ by magnetic susceptibility $\chi$and specific heat $C$ measurements. For small Cu-amounts $x\leq 0.4$ the datareveal single-ion scaling with regard to the Ce-concentration, while for largerCu-concentrations the AFM transition (encountered in theCeNi$_{9-x}$Cu$_x$Ge$_4$ series) is found to be completely depressed.Calculation of the entropy reveal that the Kondo-effect still shields the4$f$-moments of the Ce$^{3+}$-ions in CeNi$_8$CuGe$_4$.

Evolution of single-ion crystal field and Kondo features in Ce$_{0.5}$La$_{0.5}$Ni$_{9-x}$Cu$_x$Ge$_4$