Abstract
Ultrasonic quantum oscillations have been studied in indium single crystals, using 10-310 MHz longitudinal waves at 1.2 to 1.3K in magnetic fields up to 6T. The observed frequencies arise from the Fermi surface in the third zone, and are in good agreement with de Haas-van Alphen effect data. Observations of crystal twinning in the samples support the view that periods attributable to alpha arms come from beta arms in the twin and that therefore the alpha arms do not exist. It is possible though that the displaced beta arms may be distorted. Effective cyclotron masses have been deduced from the temperature variation of oscillation amplitude.
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