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Phys. Rev. B 72, 045103 (2005) [7 pages]

Kondo insulator description of spin state transition in FeSb2

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C. Petrovic1, Y. Lee1,2, T. Vogt1,2, N. Dj. Lazarov3, S. L. Bud’ko4, and P. C. Canfield4
1Physics Department, Brookhaven National Laboratory, Upton, New York 11973-5000, USA
2Center for Functional Nanomaterials, Brookhaven National Laboratory, Upton, New York 11973-5000, USA
3Laboratory of Theoretical and Solid State Physics, Institute of Nuclear Sciences, Vinca, P. O. Box 522, 11001 Belgrade, Serbia
4Ames Laboratory and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA

Received 31 January 2005; published 1 July 2005

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 Grüneisen parameter has been determined. We discuss here the relevance of a Kondo insulator description for this material.

© 2005 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.72.045103
DOI:
10.1103/PhysRevB.72.045103
PACS:
75.30.Mb, 75.20.Hr, 71.28.+d, 61.50.Ks
 
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