Electric Field Gradients at the In Site in Au-In Compounds *

Interface compound studies on the Au-In system [1,2] have shown that Auln 2 is formed below and around room temperature. Auln2 exhibits a CaF2 structure of cubic symmetry leading to a vanishing electric field gradient (EFG) at the lattice sites. Application of the perturbed angular correlation (PAC) method to detect the other intermetallic compounds formed in the interface region at elevated temperatures requires the knowledge of the hyperfine interactions of PAC probes, present in the lattices of the bulk compounds. We report a PAC study of bulk AuxIn (1 _x) samples with different stoichiometrics. The quadrupole interaction o f 1 1 ln(ß') Cd probe was observed at different temperatures. The EFG a t 1 1 *Cd was measured, but the actual position of probe nuclei is determined by that of the parent U 1 l n , chemically identical with one of the compound constituents.