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Electronic Structure Of Copper-Rich Copper-Palladium Alloys, R. S. Rao, A. Bansil, H. Asonen, M. Pessa
Electronic Structure Of Copper-Rich Copper-Palladium Alloys, R. S. Rao, A. Bansil, H. Asonen, M. Pessa
Arun Bansil
In considering the electronic structure of (Cu-rich) CuPd alloys, we present computations of complex-energy bands and average densities of states together with the angle-resolved photoemission spectra from the (100), (111), and (110) surfaces of Cu₉₅Pd₅ and Cu₈₅Pd₁₅ single crystals. The impurity spectrum in CuPd is found to be dominated by two quite-well-separated Pd-derived impurity bands and differs sharply from the case of CuNi or AgPd systems, where only a single Ni- or Pd-related impurity structure appears in the alloy. Extensive comparisons between the theory and experiment are carried out with regard to the positions and halfwidths of the Pd-induced impurity …
Electronic Structure Of Disordered Cupd Alloys: A Two-Dimensional Positron-Annihilation Study, L. C. Smedskjaer, R. Benedek, R. W. Siegel, D. G. Legnini, M. D. Stahulak, A. Bansil
Electronic Structure Of Disordered Cupd Alloys: A Two-Dimensional Positron-Annihilation Study, L. C. Smedskjaer, R. Benedek, R. W. Siegel, D. G. Legnini, M. D. Stahulak, A. Bansil
Arun Bansil
Two-dimensional-angular-correlation experiments using positron-annihilation spectroscopy were performed on a series of disordered Cu-rich CuPd-alloy single crystals. The results are compared with theoretical calculations based on the Korringa-Kohn-Rostoker coherent-potential approximation. Our experiments confirm the theoretically predicted flattening of the alloy Fermi surface near [110] with increasing Pd concentration. The momentum densities and the two-dimensional-angular-correlation spectra around zero momentum exhibit a characteristic signature of the electronic states near the valence-band edge in the alloy.