ELECTRONIC-STRUCTURE AND TRANSPORT-PROPERTIES OF AUCL3-GIC

We report the optical reflectance, magnetic susceptibility, and magnet oresistance of the first stage AuCl3-GIC which has the shortest c-axis repeat distance among transition metal chloride GICs. The optical ref lectance is not explained only in terms of the graphitic pi-system. Th e observed Pauli paramagnetic susceptibility is about three times as l arge as that from the graphitic pi-system. These results suggest the e xistence of the AuCl3-intercalate band which enhances the density of s tate at the Fermi although the electrons in the intercalate are more l ocalized than those in the graphitic plane, judging from the magnetore sistance.