It is shown that for the diluted magnetic semiconductors Sn 1-x Mn x Te a critical carrier density (p c approximately=3*10 20 cm -3 ) can be found above which ferromagnetic behaviour is displayed. This behaviour can be explained with a two-band RKKY model. Preliminary experiments on the nature of the low-temperature phase are presented.
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Jonge et al. (1990) studied this question.
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