Abstract
The electronic band structure of the first stage alkali-metal graphite intercalation compounds (C8K, C8Rb and C8Cs) was determined by angle-resolved ultraviolet photoelectron spectroscopy. The dispersive feature of the π* bands at\(\tilde K\) point in the Brillouin zone was clearly observed in all the compounds. The electron occupancies in the π* band of C8K, C8Rb and C8Cs were estimated to be 0.5±0.05 e (e; unit electronic charge), 0.45±0.05 e and 0.4±0.05 e, respectively. This strongly suggests that another half of the unit electronic charge is accommodated in the three-dimensional band at Γ point, which forms a spherical Fermi surface at the center of the Brillouin zone. The character of the three-dimensional band at Γ point was also discussed.
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Gunasekara, N., Takahashi, T., Maeda, F. et al. Angle-resolved ultraviolet photoemission study of first stage alkali-metal graphite intercalation compounds. Z. Physik B - Condensed Matter 70, 349–355 (1988). https://doi.org/10.1007/BF01317241
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DOI: https://doi.org/10.1007/BF01317241