An electron paramagnetic resonance study was made of samples which had been quenched after diffusing Au or Pt from a metallic layer on the surface. This resulted in the presence of 2 types of paramagnetic center which replaced the donor P center. According to the analysis, these centers consisted of a P donor; with a self-interstitial in either the nearest-neighbor or next-nearest neighbor position. This supported the suggestion that large numbers of self-interstitials were produced by such a treatment. The P or As impurities acted as stabilizing entities. This was confirmed by a modified donor hyperfine interaction which exhibited a strong temperature dependence. The results were explained by strain fields and a chemical shift caused by a self-interstitial which neighbored a P atom. Two configurations of this complex differed only slightly in energy.

O.Scheerer, U.Juda, M.Höhne: Physical Review B, 1998, 57[16], 9657-62