Kondo Insulator description of spin state transition in FeSb2
  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 t_{2g} multiplet. However, high pressure powder diffraction data show no sign of a structural phase transition up to 7GPa. A bulk modulus B=84(3)GPa has been extracted and the temperature dependence of the Gruneisen parameter has been determined. We discuss here the relevance of a Kondo insulator description for this material. 
C. Petrovic, Y. Lee, T. Vogt, N. Dj. Lazarov, S. L. Bud'ko and P. C.   Canfield