Excitonic ferromagnetism in the hexaborides

Details Excitonic ferromagnetism in the hexaborides Excitonic ferromagnetism in the hexaborides

1999-04-22

arxiv.org/abs/cond-mat/9904330v1

Nature 402, 251 (1999) [shorten version]

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 3 figures

Scientific paper

10.1038/46207

A ferromagnet with a small spontaneous moment but with a high Curie temperature can be obtained by doping an excitonic insulator made from a spin triplet exciton condensate. Such a condensate can occur in a semimetal with a small overlap or a semiconductor with a small bandgap. We propose that it is responsible for the unexpected ferromagnetism in the doped hexaboride material Ca_{1-x}La_xB_6.

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