Determination of the Fermi Surface of Molybdenum Using the de Haas—van Alphen Effect

The de Haas---van Alphen effect in molybdenum has been studied in detail using large impulsive magnetic fields. Digital data recording, fast Fourier-frequency analysis by computer, and dynamic calibration of the entire apparatus have been used to obtain the de Haas---van Alphen frequencies to a high degree of accuracy. Several new frequency branches associated with the electron-jack piece of the Fermi surface are reported. Frequency branches exhibiting high angular accuracy and resolution are reported for all branches that have previously been detected by other de Haas---van Alphen investigators. A quantitative description of all sheets of the Fermi surface is presented, along with comparisons with other Fermi-surface radii obtained by use of the radio-frequency-size-effect (RFSE) technique. The Mueller inversion technique for obtaining Fermi-surface radii from the de Haas---van Alphen area data was used whenever possible. The de Haas---van Alphen results presented are consistent with an estimate of 2.5% of the $\ensuremath{\Gamma}H$ dimension for the size of the gap between the jack and the octahedral Fermi-surface pieces. Thus the question about the size of this gap as raised by discrepancies greater than the combined experimental errors existing in current RFSE data is resolved. The spin-orbit parameter is not found to be anomalously higher than that for tungsten.