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Ferromagnetism in the hexaborides

Author

Listed:
  • M. E. Zhitomirsky

    (Institut für Theoretische Physik)

  • T. M. Rice

    (Institut für Theoretische Physik)

  • V. I. Anisimov

    (Institut für Theoretische Physik
    Institute of Metal Physics)

Abstract

The cubic hexaborides of the rare-earth elements have a wide variety of physical properties, despite their simple crystallographic structures. For example, the ‘doped’ hexaboride Ca1−xLaxB6 is ferromagnetic1, even though it has no partially filled d- or f-orbitals, which are usually required for magnetism. Here we show that a ferromagnet with a small magnetic moment but with a high Curie temperature can be obtained by doping an excitonic insulator (one containing a condensate of a spin-triplet state of electron–hole pairs). We propose that this mechanism is responsible for the ferromagnetism of doped hexaborides.

Suggested Citation

  • M. E. Zhitomirsky & T. M. Rice & V. I. Anisimov, 1999. "Ferromagnetism in the hexaborides," Nature, Nature, vol. 402(6759), pages 251-253, November.
    • Handle: RePEc:nat:nature:v:402:y:1999:i:6759:d:10.1038_46207
    DOI: 10.1038/46207
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