Abstract
The hyperfine fields and the local magnetic moments in a series of alloys of isoelectronic transition impurities diluted in iron are discussed. We intend to show that, even within a very simplified model, period effects for isoelectronic impurities at the beginning of an n-d series (e.g., Sc, Y, and Lu) are dominated by the charge difference effect, inducing a very strong repulsive potential. We find that the local impurity magnetic moments are very close to each other, leading to hyperfine fields, in fair agreement with experimental data. Our calculation accounts for the general trends of the local impurity moments in ferromagnetic Fe, despite quantitative deviations that do occur, due to the very simple structure of this model. We point out, however, that our calculation is a starting point for a more refined one, dealing with rare-earth impurities (such as Eu, Gd, and Tb) placed in the Fe host, where the strong charge effects are present, together with f-spin scattering.
Published Version
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