Magnetoacoustic Measurements of the Fermi Surface of Copper

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Abstract
Oscillations in the attenuation of 600-MHz LA waves propagated along the principal symmetry direction of copper single crystals are examined as a function of magnetic field in a perpendicular plane. Frequencies of the magnetoacoustic oscillations are associated with the responsible electron-orbit groups on the Fermi surface and, from them, radial dimensions are derived. These dimensions are standardized by means of open-orbit resonances in terms of Brillouin-zone dimensions. This also gives an independent measurement of the velocity of sound at ultrahigh frequencies. A close correlation is found between measured dimensions and the Koringa-Kohn-Rostoker (KKR) calculation by Faulkner et al. A generally good fit of the measured dimensions to a recent synthesis of the copper Fermi surface by Halse and Shoenberg from de Haas-van Alphen (dHvA) data is also observed.