Anisotropy of the many-body enhancements on the Fermi surface of Pd

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Abstract
A new Korringa-Kohn-Rostoker parametrization of the cyclotron effective masses in Pd based on the data reported in the preceding paper is described. The parametrization was used to derive the many-body-enhanced Fermi velocities of electrons in the high-symmetry planes on each of the four sheets of the Fermi surface, the enhanced density of states for each sheet, and the total enhanced density of states. The total enhanced density of states agrees with the value derived from specific-heat measurements to within 2.9%. Comparison of the results of the parametrization with Fermi velocities and densities of states derived from one-electron band calculations give a detailed picture of the anisotropy of the total many-body enhancement in the Fermi velocity to the density of states over the Fermi surface. Estimates of the anisotropy of the electron-electron enhancement are obtained by subtraction from the total enhancement of the electron-phonon contribution as calculated by Pinski and Butler based on the rigid muffin-tin approximation. The electron-electron enhancement obtained in this way shows considerable variation from sheet to sheet.