Fermi Surface Measurements on the Low Carrier Density Ferromagnet Ca1-xLaxB6 and SrB6

Abstract

Recently it has been discovered that weak ferromagnetism of a dilute 3D 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-dB6 and Sr-deficient Sr1-dB6. 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.

4 pages, 5 figures, submitted to PRL

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• Electronic Structure of Calcium Hexaboride within the Weighted Density Approximation
• Charge dynamics and "ferromagnetism" of A1-xLaxB6 (A=Ca and Sr)
• Gradual transition from insulator to semimetal of Ca${}_{1-x}$Eu${}_x$B${}_6$ with increasing Eu concentration
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• Optical spectroscopy study on the electronic structure of $E{u}_{1-x}C{a}_x{B}_6$
• Theory of Ferromagnetism in Ca1-xLaxB6
• Theory of Excitonic States in CaB6