Homogeneous strain response of the Fermi surface of molybdenum

Abstract

The response of the Fermi surface of a cubic transition metal to homogeneous uniaxial deformation of the lattice is investigated in detail both experimentally and theoretically for the first time. The uniaxial stress dependence of several cross sections of the Fermi surface of molybdenum is measured by the combined oscillatory magnetostriction and torque method, and the results are analyzed to yield separately the dependence on tetragonal shear and isotropic dilation. The Korringa-Kohn-Rostoker method of band-structure calculation is extended to include the effects of uniaxial strain. The experimental results are compared with those calculated from a phase-shift model derived from measured Fermi-surface cross sections, and the volume dependence of the phase shifts is determined from the dilation data. Quantitative predictions of the angular shear dependence of the areas of principal orbits on the Fermi surface of molybdenum are made on the basis of the phase-shift model.