co nd - m at / 9 91 05 16 1 N ov 1 99 9 Band structure of stage 1 - 3 PdAl 2 Cl 8 intercalated graphite
نویسندگان
چکیده
The effect of staging (n≤ 3) on the two-dimensional (2D) Fermi surface of PdAl 2 Cl 8 acceptor-type graphite intercalation compounds (GICs) has been investigated by the Shubnikov-de Haas effect. For the stage 1 and stage 2 compounds, one and two fundamental frequencies are observed, respectively. The measured angular variation of the fundamental frequencies confirms the 2D nature of the stage 1-2 compounds. The energy spectrum is adequately described by the Blinowski-Rigaux 2D band structure model. We extract values for the intraplane carbon-carbon interaction parameter γ 0 of 2.94 eV and 2.60 eV for the stage 1 and stage 2 compound, respectively. For the stage 3 compound, the Blinowski-Rigaux model no longer applies and clear deviations from the 2D behavior are found. For one of the fundamental frequencies we find that the Fermi surface is a weakly undulating cylinder. The undulation is attributed to additional interactions between the graphite subsets across the intercalant layers, with an energy parameter t= 5.6 meV.
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