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A new maganese-related isotropic electron-spin-resonance signal at g=2.77 has been observed in GaAs. It is shown to arise from the neutral Mn acceptor, Mn⁰. The analysis gives an answer to the longstanding question of whether the structure of Mn⁰ correponds to the 3d⁴ or to the 3d⁵+hole. The data clearly favor the latter case, thus revealing that Mn is an exception within the 3d acceptor family in GaAs.
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Schneider et al. (1987) studied this question.
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