Magnetoacoustic Oscillations in the Velocity of Sound in Aluminum

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Abstract
Small oscillations in the longitudinal velocity of sound have been observed as a function of magnetic field strength in aluminum at 100 Mc/sec. These oscillations are shown to arise from geometric resonances and are analogous to the oscillations in the attenuation arising from the same mechanism. The dimensions of the Fermi surface of aluminum calculated from these oscillations agree with previously published results. A comparison of the oscillations in the velocity with those in the attenuation indicates that the shift in the velocity is more sensitive to the geometric resonances than is the attenuation.