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Angle-Resolved Photoemission-Study Of (100), (110), And (111) Surfaces Of Cu0.9a10.1: Bulk And Surface Electronic-Structure Of The Alloy, H. Asonen, M. Lindroos, M. Pessa, P. Prasad, R. Rao, A. Bansil
Angle-Resolved Photoemission-Study Of (100), (110), And (111) Surfaces Of Cu0.9a10.1: Bulk And Surface Electronic-Structure Of The Alloy, H. Asonen, M. Lindroos, M. Pessa, P. Prasad, R. Rao, A. Bansil
Arun Bansil
We present angle-resolved photoemission spectra from the low-index faces of CuAl single crystals using 16.85- and 21.22-eV radiation, together with the computed bulk electronic structure of the alloy within the framework of the muffin-tin coherent-potential approximation (CPA). The d-band complex of Cu is found to suffer shifts of less than 0.1 eV on alloying, whereas the states of s-p symmetry are lowered in energy by as much as on the order of 1 eV. The dispersion curve of the uppermost valence band is measured and with the extrapolation of this curve to the Fermi energy (EF), the Fermi-surface radii along …
Composition Dependence Of Optical Gaps In Copper-Based Hume-Rothery Alloys, R. S. Rao, R. Prasad, A. Bansil
Composition Dependence Of Optical Gaps In Copper-Based Hume-Rothery Alloys, R. S. Rao, R. Prasad, A. Bansil
Arun Bansil
We discuss the composition dependence of a number of critical energy gaps in the Cu-based Hume-Rothery alloys CuZn, CuAl, and CuGe. Our computations, employing the Korringa-Kohn-Rostoker coherent-potential approach, provide a remarkably simple and consistent explanation of a variety of available optical experiments on these systems. Polyvalent impurities are found to influence the spectrum of Cu in a manner which varies strongly from one solute to another.