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 |
---|---|
Main Authors | , , , |
Format | Journal Article |
Language | English |
Published |
Amsterdam
Elsevier B.V
01.06.2011
Elsevier |
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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.
► 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 |
---|---|
AbstractList | 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 |
Author | Kowalczyk, A. CheŁkowska, G. Falkowski, M. Toliński, T. |
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Cites_doi | 10.1016/0304-8853(88)90010-8 10.1103/PhysRevB.27.7330 10.1103/PhysRevB.28.4315 10.1007/s10582-004-0083-6 10.1016/0921-4526(94)00426-V 10.1103/PhysRevB.44.8304 10.1209/0295-5075/5/6/011 10.1016/0925-8388(94)90212-7 10.1016/j.jallcom.2009.10.028 10.12693/APhysPolA.115.123 10.1002/pssb.200460055 10.1007/BF01313537 10.1016/0921-4526(91)90527-L 10.1016/S0304-8853(97)90013-5 |
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Keywords | X-ray photoemission Rare earth compound Heavy fermion Valence fluctuation Magnetic susceptibility Nickel alloys Cerium alloys Hybridization Gallium alloys Hexagonal lattices Copper alloys Rare earth alloys Chemical composition Mixed valence Transition element alloys X-ray photoelectron spectra |
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Snippet | 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... |
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StartPage | 1678 |
SubjectTerms | Clean metal, semiconductor, and insulator surfaces Condensed matter: electronic structure, electrical, magnetic, and optical properties Electron and ion emission by liquids and solids; impact phenomena Electron states Exact sciences and technology Heavy fermion Magnetic properties and materials Magnetic susceptibility Magnetically ordered materials: other intrinsic properties Photoemission and photoelectron spectra Physics Rare earth compound Strongly correlated systems; heavy fermions Valence fluctuation Valence fluctuation, kondo lattice, and heavy-fermion phenomena X-ray photoemission |
Title | X-ray photoemission and magnetometric studies of valence changes in Ce(Cu 1− x Ni x ) 4Ga |
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