Band structure andAu197Nuclear-Magnetic-Resonance Studies in AuAl2, AuGa2, and AuIn2

Measurements of the ${}_{}{}^{197}{}_{}{}^{}\mathrm{Au}$ Knight shift in Au${\mathrm{Al}}_2$, Au${\mathrm{Ga}}_2$, and Au${\mathrm{In}}_2$ are reported. In contrast to the strong temperature dependence of the ${}_{}{}^{71}{}_{}{}^{}\mathrm{Ga}$ Knight shift, only a weak temperature dependence of the ${}_{}{}^{197}{}_{}{}^{}\mathrm{Au}$ Knight shift in Au${\mathrm{Ga}}_2$ is observed. Electronic energy-band calculations for these compounds yield differences which provide an improved model for interpreting these and other experimental results.