Magnetic Susceptibility of Weakly Interacting Donors in Germanium

The magnetic susceptibility of $n$-type germanium with donor concentrations between ${10}^{16}$ ${\mathrm{cm}}^{-3\mathrm{}}$ and 2×${10}^{17}$ ${\mathrm{cm}}^{-3\mathrm{}}$ has been measured by using the Faraday method in order to investigate the interactions between donors. The measurements were made between 4.2 and 1.35°K. The susceptibility of antimony-doped germanium has been contrasted to that of arsenic-doped germanium.