Electric Field Gradients in Dilute Alloys of Silver

The directional correlation of the gamma rays emitted in the decay of ${\mathrm{Cd}}^{111}$ has been measured with the cadmium embedded in the cubic silver lattice in order to observe the electric field gradients produced by various solute atoms. The alloys studied contained small concentrations of cadmium, indium, tin, antimony, or germanium. The results were compared to various theories of screening and were found to be in agreement with a $\frac{cos(2kr+\phi )}{r^3}$ falloff of shielding charge, where $k$ is the wave number at the Fermi surface. This work corroborates recent results of Rowland by an independent method.