X-ray photoemission and magnetometric studies of valence changes in Ce(Cu1−xNix)4Ga |
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Authors: | T. Toliński G. Che?kowskaM. Falkowski A. Kowalczyk |
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Affiliation: | a Institute of Molecular Physics, PAS, Smoluchowskiego 17, 60-179 Poznań, Poland b Institute of Physics, Silesian University, Katowice, Poland |
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Abstract: | The compounds Ce(Cu1−xNix)4Ga crystallize in the hexagonal CaCu5-type structure for the whole doping range 0≤x≤1. The border compounds CeCu4Ga and CeNi4Ga represent a heavy fermion and fluctuating valence systems, respectively. We report on the studies of the valence evolution in Ce(Cu1−xNix)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 4f1 states for up to x=0.5. |
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Keywords: | Rare earth compound X-ray photoemission Magnetic susceptibility Valence fluctuation Heavy fermion |
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