Optical and Electrical Properties of Graphite Intercalated withHNO3

Abstract

Drude edges are observed in reflectance spectra and compared with the dc transport measurements in the lamellar compounds ${\mathrm{C}}_{6n}\mathrm{H}{\mathrm{NO}}_3$ with $n=1, 2, \mathrm{and} 3$. Both measurements confirm the general metallic character of these materials, but the optical data are inconsistent with a simple Drude model. We suggest that this is due either to a complex background dielectric constant or to a multiple-carrier Fermi surface.