Topic
Coherent potential approximation
About: Coherent potential approximation is a research topic. Over the lifetime, 1930 publications have been published within this topic receiving 36805 citations.
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TL;DR: In this paper, a self-consistent spin-polarized surface Green's function was developed for describing the electronic and magnetic properties of random transition metal surfaces, and applied to random FeCo overlayers on a non-random fcc Cu(001) substrate.
3 citations
TL;DR: In this paper, the vibrational density of amorphous silicon was obtained by extending the Coherent Potential Approximation to the bonds in a Bethe lattice model. But the results were not applied to treat other impurities in similar amorphized systems.
Abstract: The vibrational density of states of amorphous Silicon, when there is a finite concentration of dangling bonds or impurities, such as hydrogen, is obtained by extending the Coherent Potential Approximation to the bonds in a Bethe lattice model. The results are encouraging and it is concluded that this theory can be applied to treat other impurities in similar amorphous systems.
3 citations
TL;DR: In this paper, angle resolved photoemission spectroscopy (ARPES) was used to study the alloy disorder effect in Hg1−xCdxTe alloys in order to make comparison with theory.
Abstract: Angle resolved photoemission spectroscopy (ARPES), a technique which provides information on the k‐resolved density of states, has been used to study the alloy disorder effect in Hg1−xCdxTe alloys in order to make comparison with theory. Using off‐normal emission with photon energies from 15 to 30 eV and assuming free‐electron final states, the band dispersions along the [111] and [100] directions were determined for CdTe and HgTe as well as for Hg0.7Cd0.3Te. Within the framework of the coherent potential approximation (CPA), the alloy disorder effect is characterized by a self‐energy term which is complex and energy dependent. The real and imaginary parts of the self‐energy term characterize the shifted energy and the damping of a particular virtual crystal eigenstate ‖n,k〉. Because of the k‐resolving power of ARPES, the alloy scattering effect can be studied by comparing the spectra of the alloy Hg1−xCdxTe, and the binaries CdTe and HgTe. The deviation of the peak position from the virtual‐crystal appro...
3 citations
TL;DR: In this article, the vibrational spectrum of a linear diatomic chain with long-range order was calculated in the coherent potential approximation, where defect bands are formed inside the gap between the acoustic and optical bands and outside the bottom of the optical band.
Abstract: The vibrational spectrum of a linear diatomic chain with long-range order is calculated in the coherent potential approximation. Defect bands are formed inside the gap between the acoustic and optical bands and outside the bottom of the optical band. The energy gaps disappear long before the chain becomes completely disordered. The density of states calculated in the coherent potential approximation is compared with the exact vibrational spectrum of the Markov chain for the same values of the short-range order parameter.
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3 citations
TL;DR: In this article, the coherent potential approximation method taking into account natural disorder connected with different states of spin components is applied to thin magnetic films with spin S = 1.c. (100).
Abstract: The coherent potential approximation method taking into account natural disorder connected with different states of spin components is applied to thin magnetic films with spin S = 1. The distribution of spontaneous magnetization as well as the temperature dependence of the critical temperature are obtained for b.c.c. (100) films. The results obtained using Tyablikov decoupling of higher order Green function are improved in relation to the Green function results obtained with the same decoupling procedure by including the line profiles of elementary excitations.
3 citations