Sn1−xMnxTe is known to be a ferromagnetic semiconductor for x>0.03. We have investigated more dilute samples and found a spin-glass state for x<0.03 as well as a double transition para→ferromagneticlike→reentrant phase for x>0.03. These properties can be explained by RKKY-like interaction between Mn moments (surrounded by their polarization cloud).
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Escorne et al. (1985) studied this question.
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