Effect of c-axis dispersion on the optical properties of acceptor-type graphite intercalation compounds

Journal Article · Fri Mar 15 04:00:00 EST 1985 · Phys. Rev. B: Condens. Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.31.3973· OSTI ID:6058834

Hoffman, D M; Eklund, P C; Heinz, R E; Hawrylak, P; Subbaswamy, K R

The c-face optical reflectance spectra of stage-1 graphite-SbCl/sub 5/ and graphite-ICl and stage-2 graphite-SbCl/sub 5/ have been measured in the photon energy range 0.08 to 10 eV. From a Kramers-Kronig analysis of the spectra, the interband contribution to the imaginary part of the dielectric function epsilon/sub 2/(..omega..) has been determined. It is found that a two-dimensional (2D) band-structure model, while describing qualitatively the spectral features below approx.3 eV, requires the use of an effective temperature much greater than the experimental temperature to explain the width of the onset for valence- to conduction-band absorption in the (stage-1 and -2) compounds. The width of a spectral feature associated with valence- to valence-band absorption in the stage-2 compounds is also not explained satisfactorily by the 2D model. It is shown that weak c-axis dispersion provides a natural explanation for the widths of both of these features.

• Research Organization: Department of Physics and Astronomy, University of Kentucky, Lexington, Kentucky 40506
• DOE Contract Number: FG05-84ER45151
• OSTI ID: 6058834
• Journal Information: Phys. Rev. B: Condens. Matter; (United States), Journal Name: Phys. Rev. B: Condens. Matter; (United States) Vol. 31:6; ISSN PRBMD
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360603* -- Materials-- Properties
ANTIMONY CHLORIDES
ANTIMONY COMPOUNDS
BAND THEORY
CARBON
CHLORIDES
CHLORINE COMPOUNDS
CLATHRATES
CORRELATIONS
ELECTRONIC STRUCTURE
ELEMENTAL MINERALS
ELEMENTS
GRAPHITE
HALIDES
HALOGEN COMPOUNDS
IODINE CHLORIDES
IODINE COMPOUNDS
KRAMERS-KRONIG CORRELATION
MINERALS
NONMETALS
OPTICAL PROPERTIES
PERMITTIVITY
PHYSICAL PROPERTIES
REFLECTIVITY
SURFACE PROPERTIES