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Electronic transport has been studied in Ce₃-ₗS₄ samples with compositions in the range x>0. 30. The results show systematic trends as a function of temperature and composition which suggest a transition between behavior typical of metals and behavior typical of insulators. The resistivity curves as a function of temperature generally go through a minimum and have an activation energy in the low-temperature range. The Seebeck coefficient and Hall coefficient also show systematic changes suggesting a division into two characteristic transport ranges. The low Hall mobility at low temperatures and the behavior of the Seebeck coefficient support the idea that the electrons are in localized states in the semi-insulator region and move by a hopping process.
Cutler et al. (Mon,) studied this question.
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