Optical Properties of Ag-Based 3d-Transition Metal Alloys. II. Effects of Alloying on the Characteristic Absorption of Ag

Abstract

The effects of alloying on the absorption edge at 4 eV for Ag-based alloys, AgTi, AgV, AgCr, AgMn, AgFe, AgCo and AgNi are investigated. The Broadening of the edge is interpreted by the lifetime broadening of the states of conduction electrons. The relaxation time estimated from the the broadening of the edge is of the same order with that evaluated from the Drude absorption. The shift of the edge is estimated by two methods; from the position of the plasma frequency and from the absorption spectrum directly. The estimated shift of the edge is smaller than the expected value in the rigid-band model except AgTi.