Two previously unreported electron paramagnetic resonance centers, LAu1 and LAu2, with C2v symmetry were observed in p-type Au-doped material after heat treatment at 1250C. In the case of LAu2, a complex resolved hyperfine structure revealed the presence of 2 equivalent Au atoms in the complex. No hyperfine structure was resolved in the case of LAu1, and no direct involvement of Au in it was established.

P.M.Williams, P.W.Mason, G.D.Watkins: Physical Review B, 1996, 53[19], 12570-3