Fermi velocities in silver: Surface Landau-level resonances

Local values of the Fermi velocity of Ag are determined along the central zones of the (100) and (110) sample planes and at the neck in the (111) plane. Resonance spectra of magnetic-field-induced quantum-surface states, known as surface Landau-level resonances (SLLR), are used along with geometric factors calculated from analytical expressions for the Fermi surface to determine the location and Fermi velocity of the resonant electrons by an iterative process. These velocities are compared to those previously derived from inversions of cyclotron mass data.