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The electronic band structures are calculated for YbFe 4 Sb 12 and its reference compound LaFe 4 Sb 12 , by using an FLAPW method. The result reveals that the Yb ions have an intermediate valence but the calculated Sommerfeld coefficient is a half of the observed value indicating the strongly correlated electron effects.
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Takegahara et al. (2002) studied this question.
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