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A theoretical study of the valence transition in Sm1 −xMxS alloys

✍ Scribed by I. Aveline; J. R. Iglesias-Sicardi

Publisher
Springer US
Year
1979
Tongue
English
Weight
457 KB
Volume
35
Category
Article
ISSN
0022-2291

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✦ Synopsis

We present a theoretical model to explain the valence transitions of Sm in Sml-xMxS alloys, where M is a transition metal (e.g., Y or La). The f-level of Sm is described as a zero-width band with a finite Coulomb repulsion U, hybridized with the d band of the alloy, which is treated in the coherent potential approximation (CPA). The results show a change of the number of 4f electrons as a function of the concentration, which explains the valence transition observed in these alloys.

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