Abstract
The compounds Ce(Cu 1− x Ni x ) 4Ga crystallize in the hexagonal CaCu 5-type structure for the whole doping range 0≤ x≤1. The border compounds CeCu 4Ga and CeNi 4Ga represent a heavy fermion and fluctuating valence systems, respectively. We report on the studies of the valence evolution in Ce(Cu 1− x Ni x ) 4Ga employing the X-ray photoemission spectroscopy (XPS) and magnetic susceptibility measurements. The photoemission of the Ce 3d peaks shows a gradual decrease of the occupation of the f states with Ni content. Simultaneously, the hybridization strength and the low temperature magnetic susceptibility are reduced. Within the valence band spectrum a transition from the dominance of the Cu 3d to the dominance of the Ni 3d states is well visible with the traces of the Ce 4f 1 states for up to x=0.5.
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