Azbel'-Kaner Cyclotron Resonance in Gold

The results of a study of Azbel'-Kaner cyclotron resonance in gold are reported. Resonances were observed for all orientations of applied magnetic field in the (110) crystallographic plane, but identification of the observed masses with specific orbits was limited to angular regions near the principal crystallographic axes because of a relatively small experimental $\omega \tau$. Partial agreement was found between the masses observed with magnetic field parallel to principal crystallographic axes and masses obtained by Shoenberg from de Haas-van Alphen measurements. Resonances were also observed with the magnetic field tipped out of the sample surface plane at small and large angles. Differences between the effects observed at small angles and those observed by other workers in copper and silver are discussed. The resonances observed at large angles are identified with orbits. The angular ranges over which these resonances were observed provide additional confirmation of the correctness of the Fermi-surface neck dimensions established by de Haas-van Alphen and magnetoacoustic geometric resonance experiments.