Abstract
By means of perturbed \ensuremath{\gamma}\ensuremath{\gamma} angular correlation (PAC) experiments using the radioactive dopants ${}^{77}\mathrm{Br},$ ${}^{111}\mathrm{Ag},$ and ${}^{111}\mathrm{In},$ the behavior of the group-I elements Li, Cu, Ag, and Au is investigated. Group-I elements are shown to form nearest- (NN) and next-nearest-neighbor donor-acceptor pairs in the II-VI semiconductor CdTe. The simultaneous occurrence of cation vacancies indicates the transition of group-I elements from substitutional to interstitial lattice sites. In case of NN pairs, the electric-field gradients measured in the PAC experiments are compared with those obtained theoretically by density-functional theory calculations. PAC experiments performed in ZnTe and ZnSe show a similar behavior regarding the donor-acceptor pairing with group-I elements in these compounds.
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