The results of x-ray and Brillouin scattering experiments on Au/Cr superlattices are presented. X-ray diffraction results indicate dramatic changes in the lattice parameters of Au and Cr perpendicular to the superlattice plane as a function of modulation wavelength and these results are used to explain the anomalous behavior observed in the elastic properties of these materials. As compared to the other metallic superlattices we have studied (viz., Nb/Cu, Mo/Ni, and V/Ni), Au/Cr is the first to show a hardening.

• Received 3 November 1986

DOI:https://doi.org/10.1103/PhysRevB.35.7813