Resonant Photoemission Study on Valence Band Satellites of CuxNi1-xand AgxPd1-xAlloy Systems

The photoelectron spectra of the Cu x Ni 1- x and Ag x Pd 1- x alloy systems have been measured by means of a resonant photoemission technique to study the alloying effecton the valence band satellite. In the Cu x Ni 1- x alloy system, the resonance intensity, which is defined as the area of the structure of the CIS of the 6 eV satellite normalized by Ni concentration, is found to increase with increasing Cu concentration. However, the difference intensity, which is defined as the difference between on- and off-resonance spectra normalized by Ni concentration, decreases with increasing Cu concentration. It is concluded that a valence electron transfer from the Ni 3 d state to the Cu 4 s state occurs upon alloying. This finding does not agree with the rigid band model, which explains the decrease in magnetic moment in terms of alloying. It is suggested that the “two-hole bound state” in the Ni or Pd atomic site is a resonant state mixed with the neighboring valence hole state in the Cu or Ag atomic site.