Electron-Energy-Loss Study of Stage-1 Potassium-Intercalated Graphite

D. M. Hwang; M. Utlaut; M. S. Isaacson; S. A. Solin

doi:10.1103/PhysRevLett.43.882

Electron-Energy-Loss Study of Stage-1 Potassium-Intercalated Graphite

D. M. Hwang, M. Utlaut, M. S. Isaacson, and S. A. Solin

Phys. Rev. Lett. 43, 882 – Published 17 September 1979

Abstract

Electron-energy-loss spectra of stage-1 K-intercalated graphite single crystals were obtained with a scanning transmission electron microscope. The complex dielectric function with electric polarization perpendicular to the $c$ axis was derived by Kramers-Kronig analysis. The energy-loss peak at 2.5 eV is consistent with previous optical measurements, while the splitting of the one at 27 eV can be interpreted by folding the Brillouin zone of pristine graphite. Splittings and shifts of the interband transitions were observed and compared with calculations.

Received 5 July 1979

DOI:https://doi.org/10.1103/PhysRevLett.43.882

Authors & Affiliations

D. M. Hwang^*, M. Utlaut, M. S. Isaacson^†, and S. A. Solin^‡

The James Franck Institute, The Enrico Fermi Institute, and The Department of Physics, The University of Chicago, Chicago, Illinois 60637

^*On leave from the Department of Physics, Tsing-Hua University, Hsinchu, Taiwan, Republic of China.
^†Present address: School of Applied and Engineering Physics, Cornell University, Ithaca, N. Y. 14853.
^‡Present address: Department of Physics, Michigan State University, East Lansing, Mich. 48824.