Abstract

An investigation of ultrasonic quantum oscillations in white tin has been carried out with the sample cooled to 0.1K in a helium dilution refrigerator. 90 MHz longitudinal ultrasonic waves were used and an electromagnet provided fields up to 2.0 T. The frequency from an orbit attributable to the neck on the fourth-zone electron surface was seen for the first time. Despite the low magnetic field, several orbits attributable to magnetic breakdown were also observed, two of these for the first time.

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