Ultrasonic attenuation in cesium for oblique magnetic fields

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Abstract
The ultrasonic attenuation of longitudinal waves was measured in cesium single crystals in oblique and transverse magnetic fields. Ultrasonic frequencies between 10 and 90 MHz were employed and the attenuation was studied at 4.2 and 1.5 °K. For an angle of 55 deg between the direction of propagation and the magnetic field direction, the change in the attenuation between zero-field value and the limiting high-field value is a direct measure of the zero-field electronic contribution to the ultrasonic attenuation. Ultrasonic absorption edges which occur in oblique magnetic fields were also studied. The results are compared with the free-electron theory.