Electric field gradients in dilute alloys of Cu, Ag and Au

In this paper we present perturbed angular correlation (PAC) measurements on100Rh and111Cd in a number of dilute alloys of Cu, Ag and Au. We discuss the electric field gradient (EFG) values derived from these and other experiments in the framework of a theory of the EFG at nearest neighbours of point defects in metals, essentially based on the screening of a point charge in a free electron gas. We include in our discussion the EFG due to a neighbour monovacancy for a number of fcc metals