Abstract
The deviations from tetrahedral symmetry induced by indium substituting for gallium in GaAs are probed by using nuclear magnetic resonance (NMR) to study the first- and second-order nuclear quadrupole interactions of the arsenic and indium atoms. The indium atoms are found to be randomly distributed on the gallium sublattice. The strain field is sufficient to affect the NMR of either the In or the As nuclei at distances of about 30 \AA{} from an In atom. Second-order nuclear quadrupole interactions in the As NMR are used to determine specific bond-angle distortions for the first shells of atoms around an In atom.
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