We have measured the Raman spectra of heavily carbon doped (pϾ10 19 cm Ϫ3) GaSb and GaAsSb. A local vibrational mode ͑LVM͒ due to carbon residing on group-V lattice sites was observed at 540 cm Ϫ1 for GaSb and 568 cm Ϫ1 for GaAs 0.44 Sb 0.56. A gap mode at 164 cm Ϫ1 was observed for GaSb. The frequency of the LVM as well as the gap mode is in quantitative agreement with recent theoretical predictions.
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