Excitonic ferromagnetism in the hexaborides

Preprint

22 April 1999

preprint
Published by arXiv in arXiv

https://doi.org/10.48550/arXiv.cond-mat/9904330

Abstract

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.

Keywords

EXCITONIC FERROMAGNETISM
SPONTANEOUS MOMENT
SMALL SPONTANEOUS
SEMICONDUCTOR
HEXABORIDES
CONDENSATE
INSULATOR
DOPING

All Related Versions

Version 1, 1999-04-22, ArXiv
Published version: Nature, 402 (6759), 251.

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