Phys. Rev. B 64, 233105 (2001) [4 pages]Fermi-surface measurements on the low-carrier density ferromagnet Ca1-xLaxB6 and SrB6Received 10 April 2001; published 15 November 2001 Recently it has been discovered that weak ferromagnetism of a dilute three-dimensional electron gas develops on the energy scale of the Fermi temperature in some of the hexaborides; that is, the Curie temperature approximately equals the Fermi temperature. We report the results of de Haas–van Alphen experiments on two concentrations of La-doped CaB6 as well as Ca-deficient Ca1-δB6 and Sr-deficient Sr1-δB6. The results show that a Fermi surface exists in each case and that there are significant electron-electron interactions in the low-density electron gas. © 2001 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.64.233105
DOI:
10.1103/PhysRevB.64.233105
PACS:
71.18.+y, 71.10.Ca, 71.35.-y, 75.10.Lp
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