Stage dependence of magnetic susceptibility of intercalated graphite

Abstract

The orbital magnetic susceptibility of two coupled graphite layers is calculated as a function of temperature and Fermi energy ($\ensuremath{\mu}$). The susceptibility is shown to be diamagnetic at small values of $\ensuremath{\mu}$, and paramagnetic at large values of $\ensuremath{\mu}$, with a paramagnetic peak at $\ensuremath{\mu}\ensuremath{\cong}{\ensuremath{\gamma}}_{1}$, where ${\ensuremath{\gamma}}_{1}$ is the interlayer coupling. These results explain the increase in the susceptibility as a function of stage which has recently been observed in ${\mathrm{KC}}_{12n}$.