Ferromagnetism in the hexaborides

M. E. Zhitomirsky, T. M. Rice () and V. I. Anisimov
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M. E. Zhitomirsky: Institut für Theoretische Physik
T. M. Rice: Institut für Theoretische Physik
V. I. Anisimov: Institut für Theoretische Physik

Nature, 1999, vol. 402, issue 6759, 251-253

Abstract: 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.

Date: 1999
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DOI: 10.1038/46207

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