Theory of magnetic susceptibility in acceptor and donor graphite intercalation compounds

Abstract

The tight binding calculation of the orbital magnetic susceptibility in Graphite Intercalation Compounds is reexamined to account for the different behaviour of Donor and Acceptor Compounds. The two dimensional tight binding model for π electrons treating symmetrically valence and conduction bands cannot explain experimental data. The inclusion of the second neighbour in-plane interaction, inducing a weak asymmetry between the valence and conduction bands, leads to a large difference in the orbital susceptibility of donor and acceptor GIC in agreement with the experimental results for first stage compounds