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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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Journal ArticleDOI
A.R. Bishop1
TL;DR: Using a Ward identity, it was proven that the coherent potential approximation predicts only extended states in an infinite, one-dimensional, arbitrarily cellularly disordered Anderson model in this paper.

1 citations

Journal ArticleDOI
TL;DR: In this paper, a selfconsistent method is presented to calculate the self-energy of an electron in amorphous solids, glassy solids and liquids within the framework of the tight binding approximation.
Abstract: For Pt. I see ibid., vol.4, L118 (1971). A selfconsistent method is presented to calculate the self-energy of an electron in amorphous solids, glassy solids and liquids within the framework of the tight binding approximation.

1 citations

Journal ArticleDOI
TL;DR: In this article, the authors performed band structure investigations of the random MoNi 4 and MoNi3 alloys, performed by emission and photoelectron spectroscopy, and showed that the changes in spectra caused by density of states structure and by additional effects involved in creation of the particular spectra.
Abstract: Band structure investigations of the random MoNi 4 and MoNi3 alloys, performed by emission and photoelectron spectroscopy, is reported. The X-ray emission and X-ray photoelectron spectra allowed to study the occupied valence band states below Fermi level. These techniques gave the full description of changes in the density of valence electron states distribution due to substitution of Mo atoms into the fcc Ni 1attice up to 25 at%. The analysis of the emission and photoelectron spectra led to clear distinction between the changes in spectra caused by density of states structure and by additional effects involved in creation of the particular spectra. The experimental data are compared with the density of states calculated using coherent potential approximation and linear muffin-tin orbital methods. PACS numbers: 71.20.Cf, 78.70.En, 79.60.—i

1 citations

Journal ArticleDOI
TL;DR: In this article, a band theory of order-disorder transition in an AB alloy is studied using the locator formalism in the coherent potential approximation. And the influence of the difference in the band widths of A and B metals on the transition temperature is discussed.

1 citations

01 Jan 2003
TL;DR: In this paper, a cluster expression for the two-time retarded Green's functions and the thermodynamic potential of a disordered crystal taking the electron-phonon and electron-electron interactions into account was obtained.
Abstract: We obtain a cluster expression for the two-time retarded Green's functions and the thermodynamic potential of a disordered crystal taking the electron-phonon and electron-electron interactions into account. The electron states of the system are described in the framework of a multiband tight-binding model. The calculations are based on the diagram techniques for temperature Green's functions. The coherent potential approximation is chosen as a zero-order one-site approximation in this cluster expansion method. We show that the contributions from the processes of scattering of elementary excitations by clusters decrease as the number of sites in the cluster increases in accordance with certain small parameters. Analytic estimates of the influence of the electron-phonon interaction on the energy spectrum of electrons of an ordered alloy are obtained in a one-band model. The applicability of these results to describing the influence of strong electron correlations on the electron structure and properties of alloys of transition metals with narrow energy bands is illustrated with the example of a Fe-Co alloy. Our results suggest possible ways to generalize the one-band Hubbard model, well-known in the theory of magnetism, to describe the influence of strong electron correlations on the electron structure and properties of disordered alloys of transition metals with narrow energy bands.

1 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20234
202222
202127
202030
201930
201840