EXPERIMENTAL-DETERMINATION OF THE PARTIAL DENSITY-OF-STATES FOR THE BINARY-ALLOYS PT3V AND PT3MN

The valence band electronic structure of the intermetallic compounds P t3V and Pt3Mn has been investigated by means of synchrotron radiation ultraviolet photoemission. The spectra exhibit band structure extendin g to approximately 8 eV below the Fermi level for each alloy. Utilizin g the Cooper minimum in the Pt 5d photoionization cross-section, the p artial densities of stares have been empirically determined. The resul ts indicate that the d bands of the constituent metals completely over lap. The V 3d states contribute most strongly to the valence band imme diately below the Fermi level. In contrast, the highest occupied densi ty of states for the Mn 3d band lies approximately 2.6 eV below the Fe rmi level. For Pt3Mn, 3p to 3d resonant photoemission confirms the res ults obtained at the Pt 5d Cooper minimum. However, no dear evidence f or a corresponding V 3p to 3d resonance was observed in Pt3V. This may indicate that the V d states in Pt3V are significantly less localized than the Mn d states in Pt3Mn. The empirical results for each alloy h ave been compared with theoretical calculations from the literature an d provide good agreement in each case.