Electronic Fine Structure in the Electron-Hole Plasma in SrB6

Abstract

Electron-hole mixing-induced fine structure in alkaline earth hexaborides leads to lower energy (temperature) scales, and thus stronger tendency toward an excitonic instability, than in their doped counterparts (viz. Ca(1-x)La(x)B(6), x=0.005), which are high Curie temperature, small moment ferromagnets. Comparison of Fermi surfaces and spectral distributions with de Haas - van Alphen (dHvA), optical, transport, and tunneling data indicates that SrB6 remains a fermionic semimetal down to (at least) 5 K, rather than forming an excitonic condensate. For the doped system the Curie temperature is higher than the degeneracy temperature.

Four two-column pages, three postscript figures. Phys. Rev. Lett. (April 2000, in press)

References in corpus (2)

• Excitonic ferromagnetism in the hexaborides
• Ferromagnetism and superstructure in Ca_{1-x}La_xB_6

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