Experimental determination of the Pd and Cu densities of states inCu75Pd25

The valence-band photoelectron spectra of ${\mathrm{Cu}}_{75}$ ${\mathrm{Pd}}_{25}$ have been measured with the use of synchro- tron radiation in the energy range 40 to 160 eV. By taking advantage of the Cooper minimum in the Pd photoelectron cross section, empirical results have been obtained for the Cu and Pd partial densities of states. These results show that the density of states of each element is distributed throughout the width of the band as predicted by recent self-consistent-field Korringa-Kohn-Rostoker coherent-potential-approximation calculations. The empirical results for the Cu density of states are in agreement with the calculations while those for the Pd density of states indicate that the calculations overestimate the Pd contribution at the bottom of the band.