Abstract
Measurements of the magnetic-field dependence of the ultrasonic attenuation of longitudinal waves in cesium single crystals have been made between 4.2° and 1.3°K. Ultrasonic frequencies between 10 and 70 Mc/sec were employed. Single crystals oriented along the [100] and [110] were used, and the magnetic field was always perpendicular to the direction of propagation. At 1.3°K, the attenuation is oscillatory and periodic in 1/H. These periods, which are related to the extremal dimension of the Fermi surface, were used to measure the anistropy in the Fermi surface of Cs in the (100) and (110) planes. These measurements will be compared with the band structure calculations of Ham and the de Haas-Van Alphen measurements of Okumura and Templeton. The attenuation measurements will also be compared with the free-electron theory of the ultrasonic attenuation due to conduction electrons. [Supported by U. S. Air Force Office of Scientific Research.]
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