Abstract
The orbital magnetic susceptibility () of graphite intercalation compounds is calculated for using a tight-binding model for the -electron energy bands and the compact expression for derived by Fukuyama, which includes both intraband and interband terms. The results are presented as an approximate analytic expression for as a function of Fermi level ( eV) and temperature. For the susceptibility is large and diamagnetic (due to interband transitions), while for eV, is paramagnetic (mainly due to intraband transitions) in contrast to the usual Landau-Peierls diamagnetism of conduction electrons in parabolic bands. Furthermore, is shown to be a sensitive function of and hence of the conduction-electron charge distribution in each graphite layer. We show that this theory accounts for the main features of the experimental data (stage and temperature dependence of ) and suggest that measurements of the stage dependence of can be used to estimate the -axis screening length in graphite intercalation compounds.
- Received 13 June 1979
DOI:https://doi.org/10.1103/PhysRevB.20.4889
©1979 American Physical Society