We report the results of electrical resistivity, magnetic susceptibility, heat-capacity, and Ce-LIII-edge X-ray absorption spectrum (XAS) measurements for a solid solution series Ce(Pt1-xRhx)Si2 (x = 0, 0.2, 0.4, 0.6, 0.8, 1.0). The results reveal that CePtSi2 is an antiferromagnetic heavy-fermion compound with TN ≈ 1.5 K. As Rh content increases, the Kondo effect gradually dominates over the magnetic ordering and drives the system towards an intermediate-valence (IV) regime with nearly quenched magnetism. Besides, we also observed non-Fermi-liquid behaviors in CePt0.4Rh0.6Si2. These results indicate that at x ≈ 0.6, the system is located in the vicinity of a quantum critical point of the evolution.
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