Mixed valence and spin fluctuations in Ce(Ni, Co)/sub 2/ and related systems
The pseudobinary alloys Ce(Ni/sub x/Co/sub 1-x/)/sub 2/, (Ce/sub x/La/sub 1-x/)Ni/sub 2/ and (Ce/sub x/Y/sub 1-x/)Ni/sub 2/, where 0 < x < 1, were studied. The room-temperature lattice constant, the magnetic susceptibility in the 6 to 300 K temperature range, the low-temperature specific heat in the 0.4 to 25 K range, and the electrical resistivity in the 0.4 to 300 K range were measured. Additionally, x-ray absorption around the L/sub 3/ edge was studied using the synchroton radiation. Both thermodynamic and L/sub 3/ probes yield similar results for the changes of valence of Ce across these systems. It was established that Ce is in the saturated valence state in the Ce(Ni/sub x/Co/sub 1-x/)/sub 2/ for x < 0.25. The valence decreases with x in the 0.25 to 1 concentration range. Similarly, the valence of Ce decreases in the (Ce, Y)Ni/sub 2/ systems upon substitution of Y for Ce. The results obtained for the (Ce/sub x/La/sub 1-x/)Ni/sub 2/ system are interpreted in terms of changes of the Ce/sup 3 +/ impurity levels. Spin fluctuations due to the 3d electrons play an important role in these systems
- Research Organization:
- Temple Univ., Philadelphia, PA (USA)
- OSTI ID:
- 5289099
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360102 -- Metals & Alloys-- Structure & Phase Studies
360104* -- Metals & Alloys-- Physical Properties
ALLOYS
CERIUM ALLOYS
COBALT ALLOYS
IMPURITIES
LANTHANUM ALLOYS
LATTICE PARAMETERS
MAGNETIC PROPERTIES
NICKEL ALLOYS
PHYSICAL PROPERTIES
RARE EARTH ALLOYS
THERMODYNAMIC PROPERTIES
VALENCE
YTTRIUM ALLOYS