Electronic structure of stage-2SbCl5-intercalated graphite

The de Haas–van Alphen (dHvA) effect of the stage-2 ${\mathrm{SbCl}}_5$-graphite intercalation compound was measured. With samples cooled quickly between 300 and 77 K in about 1 h many dHvA oscillations were observed. The dHvA spectrum obtained with samples cooled slowly in 24 h consisted of two oscillations coming from the basic graphitic bands and a low-frequency oscillation coming from intercalate-depleted regions near the edges of the samples. The frequencies of the dHvA oscillations and carrier cyclotron masses of the basic graphitic bands were compared to the predictions of two-dimensional energy band models and the value of the Fermi energy of -0.88 eV was obtained. The electron-phonon mass-enhancement parameter of 0.015 was estimated from the measured band parameters and the conductivity data. The charge transfer of 0.0205 elementary charge per carbon atom was also obtained from the values of the dHvA frequencies.