Phys. Rev. B 65, 014428 (2001) [7 pages]Weak ferromagnetism and excitonic condensatesReceived 17 May 2001; published 11 December 2001 We investigate a model of excitonic ordering (i.e., electron-hole pair condensation) appropriate for divalent hexaborides. We show that the inclusion of imperfectly nested electron-hole Fermi surfaces can lead to the formation of an undoped excitonic metal phase. In addition, we find that weak ferromagnetism with compensated moments arises as a result of gapless excitations. We study the effect of low-lying excitations on the density of states, Fermi-surface topology, and optical conductivity, and compare to available experimental data. © 2001 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.65.014428
DOI:
10.1103/PhysRevB.65.014428
PACS:
71.35.Cc, 71.20.-b
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