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Ferromagnetism was recently observed at unexpectedly high temperatures inLa-doped CaB_6. The starting point of all theoretical proposals to explain thisobservation is a semimetallic electronic structure calculated for CaB_6 withinthe local density approximation. Here we report the results of parameter-freequasiparticle calculations of the single-particle excitation spectrum whichshow that CaB_6 is not a semimetal but a semiconductor with a band gap of 0.8eV. Magnetism in La_xCa_{1-x}B_6 occurs just on the metallic side of a Motttransition in the La-induced impurity band.Comment: 4 pages, 1 postscript figur

physical review letters

<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>CaB</mml:mi></mml:mrow><mml:mrow><mml:mn>6</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>: A New Semiconducting Material for Spin Electronics

CaB6: A New Semiconducting Material for Spin Electronics