CaB6 : a new semiconducting material for spin electronics

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

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Abstract

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)016401-1/4
Number of pages4
JournalPhysical Review Letters
Volume87
Issue number1
DOIs
Publication statusPublished - 2001

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