Abstract
The magnetoacoustic effect has been observed in high-purity cesium single crystals. Longitudinal waves of frequencies 30-70 MHz were employed. The momentum obtained from the period of the geometric oscillations indicates that the Fermi surface of cesium is distorted from a sphere, bulging about 4% in the [110] direction and depressed approximately 1% in the [100] and [111] directions. The results are compared with the de Haas-van Alphen measurements in cesium, and the positions of the attenuation extrema are compared with the free-electron theory of ultrasonic attenuation.
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