Electronic properties of stage-3 SbCl5-intercalated graphite.

Abstract

The stage-3 antimony pentachloride--graphite intercalated compound has three groups of de Haas--van Alphen (dHvA) frequencies with the magnetic field parallel to the c axis. The dominant frequency from the first group and the two average frequencies from the second and third groups are identified with the basic graphitic bands. These frequencies are used to determine ${\ensuremath{\gamma}}_{0}$, ${\ensuremath{\gamma}}_{1}$, and \ensuremath{\delta} in Blinowski's band model and to calculate energy bands. The energy differences between the valence bands at the Fermi level are in agreement with the optical-reflectance experimental results of Hoffman et al. The predicted cyclotron masses are within 12% of the measured values. The charge distribution along the ${k}_{z}$ direction of the three graphite layers of the stage-3 compound is determined to be between the uniform charge distribution and that of metallic sandwich models. This results from the screening effect of the external graphite layers. The splitting of dHvA frequencies in each group is attributed to undulation of the Fermi surface along the ${k}_{z}$ direction and to the presence of intercalant islands.