STRESS DEPENDENCE OF THE FERMI-SURFACE OF GOLD

Derivatives of the five principal extremal cross sections of the Fermi surface of gold with respect to uniaxial stress along various directi ons have been determined from simultaneous measurements of the amplitu des of magnetostriction and torque quantum oscillations. The accuracy of the measurements is limited by a spurious magnetostriction signal c aused by the crystal bending in response to the torque it experiences when its symmetry axis is misaligned with the magnetic field direction . The results are self-consistent and agree with the results of the di rect tension measurements and with stress derivatives calculated from the absolute magnetostriction amplitude measurements. Discrepancies wi th results from other experimental work are discussed. Angular and tet ragonal shear strain derivatives deduced from experiment agree within the combined range of uncertainty with theoretical values. The differe nces between experimental and theoretical values for gold are similar to those for copper.