Mössbauer Effect in Europium Alloys

Abstract

The Mössbauer effect of the 21.7-keV $\gamma$ line of ${\mathrm{Eu}}^{151}$ 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.