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Electron spin resonance (ESR) has been detected for erbium, Er(4f 11 ), in gallium arsenide. The ESR spectrum was found to be isotropic, with a hyperfine splitting of A( 167 Er)=208*10 -4 cm -1 and a g-factor of g=5.921. The magnitude of the latter is compatible with a Gamma 7 (T 4 ) ground state, as expected for a substitutional Er Ga (4f 11 ):GaAs defect.
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Baeumler et al. (1987) studied this question.
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