Optical Properties of Ag-Based 4d-Transition Metal Alloys

Abstract

The dielectric constants of Ag-based alloys with a small amount of Zr, Nb and Mo are evaluated from measurements of reflectances and transmittances of thin films prepared by simultaneous evaporation in vacuum for photon energies between 0.55 eV to 5.63 eV. The dc resistivities and the thermoelectric powers of the films are also measured. An additional absorption band due to the presence of the virtual bound state is observed for all alloy systems. The data are compared with the calculation based on the Friedel-Anderson model. The positions of the virtual bound states of the alloys are estimated.