Hyperfine fields at transition-element impurities in Gd

Low-temperature nuclear-orientation measurements on a number of dilute alloys of $3d$ and $4d$ transition elements in Gd host are reported. The derived hyperfine fields in kG are: $\mathrm{Gd}\mathrm{V}$, -87.4±9.2; $\mathrm{Gd}\mathrm{Cr}$, +23.1±5.4.; $\mathrm{Gd}\mathrm{Mn}$, + 186.4±4.3; $\mathrm{Gd}\mathrm{Y}$, -150±7; $\mathrm{Gd}\mathrm{Zr}$, -100±15; $\mathrm{Gd}\mathrm{Nb}$, -92.9±0.8; $\mathrm{Gd}\mathrm{Mo}$, +49±6 or -40 (see text); and $\mathrm{Gd}\mathrm{Tc}$, +87.6±2.9. In addition, a Mössbauer-effect source experiment gives for $\mathrm{Gd}\mathrm{Fe}$ a hyperfine field of 0±16 kG. These results nearly complete the systematics for $3d$ and $4d$ impurities in Gd host, and support the model for Gd proposed by Campbell. We discuss the derived values of local moments for $3d$ and $4d$ impurities in Gd.