X-ray photoemission and magnetometric studies of valence changes in Ce(Cu 1− x Ni x ) 4Ga
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−...
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Published in | Journal of magnetism and magnetic materials Vol. 323; no. 12; pp. 1678 - 1681 |
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Main Authors | , , , |
Format | Journal Article |
Language | English |
Published |
Amsterdam
Elsevier B.V
01.06.2011
Elsevier |
Subjects | |
Online Access | Get full text |
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Summary: | 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.
► Ni substitution for Cu in CeCu
4Ga leads to the loss of Ce 4f states localization. ► Valence fluctuations visible in the XPS of Ce 3d states. ► Magnetic susceptibility measured and the valence resolved up to 1000
K. ► Importance of the temperature independent susceptibility |
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ISSN: | 0304-8853 |
DOI: | 10.1016/j.jmmm.2011.01.036 |