Hyperfine fields at transition-element impurities in Gd

Abstract

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\ifmmode\pm\else\textpm\fi{}9.2; $\mathrm{Gd}\mathrm{Cr}$, +23.1\ifmmode\pm\else\textpm\fi{}5.4.; $\mathrm{Gd}\mathrm{Mn}$, + 186.4\ifmmode\pm\else\textpm\fi{}4.3; $\mathrm{Gd}\mathrm{Y}$, -150\ifmmode\pm\else\textpm\fi{}7; $\mathrm{Gd}\mathrm{Zr}$, -100\ifmmode\pm\else\textpm\fi{}15; $\mathrm{Gd}\mathrm{Nb}$, -92.9\ifmmode\pm\else\textpm\fi{}0.8; $\mathrm{Gd}\mathrm{Mo}$, +49\ifmmode\pm\else\textpm\fi{}6 or -40 (see text); and $\mathrm{Gd}\mathrm{Tc}$, +87.6\ifmmode\pm\else\textpm\fi{}2.9. In addition, a M\"ossbauer-effect source experiment gives for $\mathrm{Gd}\mathrm{Fe}$ a hyperfine field of 0\ifmmode\pm\else\textpm\fi{}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.