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The photoemission valence band structure of Hume-Rothery-type (Ag0.5Cu0.5)100-xGex (x=20,22.5 and 25) metallic glasses

Photoemission spectra are reported, from the valence band region, obtained through UPS He II, He I and MXPS measurements, using liquid-quenched (Ag0.5Cu0.5)100-xGex metallic glass samples with Ge contents of x=20, 22.5 and 25. Band calculations performed for hypothetical (Cu3Au-type) Ag3Ge and Cu3Ge compounds reveal essentially the same features in the valence band as those established from the present spectroscopic data. In addition, these data confirm that the density of states decreases smoothly towards the Fermi level without there being any indication of a distinct minimum or maximum. The authors conclude that the observed declining slope near the Fermi level reflects the d band tail, which is enhanced due to the sp-d hybridisation effect. Any structure-induced effect, if it exists, is too small to be detected by the UPS measurements. Combining present results with those established previously from measurements of electronic specific heats, they are led to believe that the stability of an amorphous structure cannot be discussed solely in terms of a structure-induced perturbation on the total density of states.