Radio-Frequency Size-Effect Measurements in Cadmium

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Abstract
The size effect occurring in the radio-frequency surface impedance in thin samples of high-purity cadmium has been observed for magnetic field rotations in the basal plane of the hexagonal structure. The third-band lens is found to be circular in the basal plane with less than 0.25% deviation for all directions. Both open and closed orbits are observed for the second band, and the shapes of the extremal sizes of this sheet of the Fermi surface in the basal plane are determined. Both the sizes and shapes of the portions of the Fermi surface calipered here are in good agreement with the available de Haas-van Alphen data. Comparison is made with the ultrasonic geometric-resonance data only along the symmetry axes, since ultrasonic results are not available for all directions in the basal plane.