The thermal expansion and heat capacity of FeSb₂ at ambient pressure agrees with a picture of a temperature induced spin state transition within the Fe t2g multiplet. However, high pressure powder diffraction data show no sign of a structural phase transition up to 7 GPa. A bulk modulus B=84(3) GPa has been extracted and the temperature dependence of the Gr\"uneisen parameter has been determined. We discuss here the relevance of a Kondo insulator description for this material.
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Petrović et al. (2005) studied this question.
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