An intermediate valence model for Ce impurities diluted in Gd metal is used to describe the formation of the Ce local magnetization. The Ce impurity and the Gd host are described as a strongly d-f correlated and hybridized system. The value obtained for the Ce valence agrees quite well with the experimental results. The temperature dependence of the hyperfine field is discussed. We briefly comment also on the case of Yb impurities diluted in Gd metal.
Using isomer shift and hyperfine data of transition-metal Mössbauer impurities 193Ir and 57Fe diluted in the ferromagnetic rare-earth hosts Gd, Tb, and Dy, the formation of local moments at these impurities based on a two-band (s-d) model in the framework of an extended Ruderman-Kittel-Kasuya-Yosida picture is theoretically discussed. The experimental data of Mössbauer isomer shifts and hyperfine fields at the nobel probe 197Au placed in Gd, Tb, and Dy are also briefly discussed, based on an extended Daniel–Friedel model. The results exhibit a good agreement with the available experimental measurements.
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