Measurements of the static paramagnetic susceptibility chi p and magnetisation M have been performed on p-type manganese-doped GaAs. Pronounced deviations from a pure Curie-type ( chi p ) or Brillouin-type (M) behaviour were observed. These can be assigned to a low-lying energy level at about 2.5 meV resulting from exchange coupling of the delocalised hole with the 3d 5 manganese acceptor core.
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Frey et al. (1988) studied this question.
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