We present a theoretical model to explain the valence transitions of Sm in Sm1 − x M x S 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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Work supported in part by CNPq and FINEP.
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Aveline, I., Iglesias-Sicardi, J.R. A theoretical study of the valence transition in Sm1 − x M x S alloys. J Low Temp Phys 35, 433–447 (1979). https://doi.org/10.1007/BF00115590
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DOI: https://doi.org/10.1007/BF00115590