Gyromagnetic factor in first and second stages of graphite intercalation compounds.

Abstract

The gyromagnetic ratio of mobile carriers in stage-1 and -2 graphite intercalation compounds has been calculated up to second-order terms in the Luttinger-Kohn formalism within the independent-subsystem approximation. It is shown that the interband terms must be included for a coherent description of ${\mathit{g}}_{\mathrm{?}}$ (magnetic field parallel to the c axis). For both stages, \ensuremath{\Delta}g=${\mathit{g}}_{\mathrm{?}}$-${\mathit{g}}_{\mathit{e}}$ is inversely proportional to the Fermi level ${\mathit{E}}_{\mathit{F}}$. The model predicts negative and positive values of \ensuremath{\Delta}g, respectively, for acceptor and donor graphite intercalation compounds. Good agreement is found by comparison with the experimental data for the acceptor compounds; the more complex case of donor graphite intercalation compounds is also discussed.