Empirical Fermi-Surface Parameters for W and Mo

Abstract

Torsion measurements have been made of the de Haas-van Alpen effect in tungsten and molybdenum. The results of these measurements are extremal cross-section areas of the Fermi surface and their corresponding cyclotron effective masses. These data are shown to be qualitatively interpretable in terms of orbits assigned to the various sheets of a Fermi-surface topology proposed by Lomer. A semiquantitative Fermi-surface model based on the Lomer topology is constructed and is shown to be compatible with the compensation of carriers, the connectivity of surfaces, the total surface area, the extremal dimensions, and the cyclotron effective masses reported by other investigators.