Second virial coefficient for the Landau diamagnetism of a two-component plasma

This paper investigates the density expansion of the thermodynamic properti es of a two-component plasma under the influence of a weak constant uniform magnetic field. We start with the fugacity expansion for the Helmholtz fre e energy. The leading terms with respect to the density are calculated by a perturbation expansion with respect to the magnetic field. We find a magne tic virial function for a low density plasma which is exact in quadratic or der with respect to the magnetic field. Using these results we compute the magnetization and the magnetic susceptibility.