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Results of recent band calculations on SmB 6 , YbB 12 , Ce 3 Pt 3 Sb 4 and CeNiSn support our previous prediction that the band gap appearing in their non-f reference systems correlates strongly with the origin of an energy gap in the mixed-valent rare-earth compounds. Based on these results, a more detailed model on the mechanism of the appearance of an energy gap is discussed.
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M. Kasaya (1992) studied this question.
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