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Full-Text Articles in Physics
Fermi-Surface Properties Of Alpha-Phase Alloys Of Copper With Zinc, R. Prasad, S. C. Papadopoulos, A. Bansil
Fermi-Surface Properties Of Alpha-Phase Alloys Of Copper With Zinc, R. Prasad, S. C. Papadopoulos, A. Bansil
Arun Bansil
We consider the Fermi-surface properties of the α-Cu1-cZnc system over the composition range 0≤c≤0.3. Our calculations are based on the application of the self-consistent coherent potential approximation to the muffin-tin Hamiltonian. The predictions of the theory with respect to the radii kneck, k100, and k110, and the size and shape of the alloy Fermi surface in several planes in the Brillouin zone are in good agreement with the available positron annihilation measurements and with the predictions of the rigid-band model. We discuss how the hitherto unmeasured disorder smearing of the alloy Fermi surface may be amenable to a direct experimental …
Observation Of A Tamm-Type State On Cu0.9al0.1(100) Surface: Disorder Effects And Bulk Electronic Structure Of An Alloy, M. Pessa, H. Asonen, R. S. Rao, R. Prasad, A. Bansil
Observation Of A Tamm-Type State On Cu0.9al0.1(100) Surface: Disorder Effects And Bulk Electronic Structure Of An Alloy, M. Pessa, H. Asonen, R. S. Rao, R. Prasad, A. Bansil
Arun Bansil
The electronic structure of a CU0.9Al0.1(100) single crystal has been studied with use of an angle-resolved photoemission technique. An intrinsic Tamm-type surface state is found to exist in the disordered alloy. The linewidth of the surface state is analyzed to deduce the disorder-induced smearing of energy levels. These and other experimental results are discussed in terms of the computed band structure of the alloy on the basis of coherent-potential approximation applied to a realistic muffin-tin Hamiltonian.
Nonlinear Composition Dependence Of The Fermi-Surface Dimensions In Alpha-Phase Copper-Germanium Alloys, R. Prasad, A. Bansil
Nonlinear Composition Dependence Of The Fermi-Surface Dimensions In Alpha-Phase Copper-Germanium Alloys, R. Prasad, A. Bansil
Arun Bansil
In considering the α-CU₁₀₀₋ₓGeₓ alloys on the basis of a realistic muffin-tin Hamiltonian, the most notable feature of the electronic spectra is found to be the appearance of an impurity band below the host conduction band. In accord with relevant experiments, a Fermi surface is predicted to grow at approximately half the rigid-band rate for x5 at.% Ge. This effect is related to a transition in the nature of states associated with the impurity band; these states are localized atomic s-like states for x≤0.5 and become delocalized in concentrated alloys.