Measurements of de Haas-van Alphen torque oscillations have been made at 1.2 K on single-crystal $n$-type InSb samples containing between 6.6×${10}^{17}$ and 4.5×${10}^{18}$ electrons/${\mathrm{cm}}^3$. The amplitude of the oscillations is found to depend on the crystallographic orientation and magnitude of the magnetic field. The anisotropy is accounted for by the warping of the conduction band and the damping by collision and inhomogeneity broadening. From the anisotropy of the period of the highest-concentration sample, we obtain $L-M-N=\frac{(8.9\mathrm{}\pm 0.7){\hslash }^2}{2m_0}$.

• Received 11 June 1970

DOI:https://doi.org/10.1103/PhysRevB.3.2608