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The temperature and concentration dependence of the EPR absorption due to the Fe 3+ state in HgSe is shown to be consistent with a Coulomb gap in the defect density of states. The latter is a consequence of inter-ion Coulomb interaction which renders a correlated ground state with short-range order of the partially ionised resonant donors. Possible mechanisms for a decrease of both the mobility and the EPR intensity for very high iron concentrations in this ordered, glass-like state are discussed.
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Wilamowski et al. (1990) studied this question.
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