Low-Field de Haas-van Alphen Effect in Gold

Detailed studies of the de Haas-van Alphen (dHvA) effect in Au single crystals have been carried out with a high-sensitivity torque magnetometer in steady fields up to 40 kG. The angular variations of all of the pertinent dHVA frequencies were determined to better than 0.1%. New low-frequency oscillations have been observed which appear to be associated with a difference frequency resulting from two extremal cross sections on the nearly spherical portion of the Fermi surface. Evidence has been obtained which suggests that the electron $g$ factor for the neck orbits in Au may differ appreciably from the value 2.