CaB6: A new semiconducting material for spin electronics

H.J. Tromp, P. van Gelderen, Paul J. Kelly, G. Brocks, Peter A. Bobbert

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138 Citations (Scopus)


Ferromagnetism was recently observed at unexpectedly high temperatures in La-doped CaB6. The starting point of all theoretical proposals to explain this observation is a semimetallic electronic structure calculated for CaB6 within the local density approximation. Here we report the results of parameter-free quasiparticle calculations of the single-particle excitation spectrum which show that CaB6 is not a semimetal but a semiconductor with a band gap of 0.8±0.1 eV. Magnetism in LaxCa1-xB6 occurs just on the metallic side of a Mott transition in the La-induced impurity band.
Original languageEnglish
Article number016401
Pages (from-to)-
Number of pages4
JournalPhysical review letters
Issue number1
Publication statusPublished - 2001


  • METIS-128760
  • IR-61276


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