Partial spectral weights of disordered CuxPd1-x alloys including the photoemission matrix-element effect.

摘要: The valence-band photoemission spectra of disordered ${\mathrm{Cu}}_{\mathit{x}}$${\mathrm{Pd}}_{1\mathrm{\ensuremath{-}}\mathit{x}}$ alloys are measured with synchrotron radiation in the soft-x-ray regime. Taking advantage Cooper-minimum phenomenon Pd 4d photoionization cross section, we obtain and Cu partial spectral weights at various compositions (x=0.1, 0.25, 0.5, 0.75, 0.9) using empirically determined ratio sections. We find that this photon energy matrix element strongly suppresses structures high-binding-energy side where coherent potential approximation calculations predicted appreciable bonding states between 3d levels. By taking x-ray regime effect is less severe, experimental weight good agreement theoretical predictions. lattice relaxation does not seem very important for suppression states, least concentrated studied here.