The M\"ossbauer effect of the 21.7-keV γ line of Eu¹⁵¹ has been employed to study the isomer shifts and the magnetic fields in Eu-Yb and Eu-Ba alloys. From these measurements the conduction-electron contribution to the hyperfine field in Eu metal due to the ion's own $4f$ electrons and due to the neighboring ions has been deduced. In addition, an explanation for the apparent lack of conduction-electron contribution to the hyperfine field in metallic Gd is offered.
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Hüfner et al. (1968) studied this question.
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