Journal ArticleDOI
An Application of the Coherent Potential Approximation to Ferromagnetic Alloys
Hideo Hasegawa,Junjiro Kanamori +1 more
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TLDR
In this paper, an application of the coherent potential approximation (CPA) to ferromagnetic alloys is discussed on the basis of a non-degenerate tight-binding model and the intraatomic coulomb interaction is taken into account selfconsistently within the framework of the Hartree-Fock approximation.Abstract:
An application of the coherent potential approximation (CPA) to ferromagnetic alloys is discussed on the basis of a nondegenerate tight-binding model. The intraatomic coulomb interaction is taken into account self-consistently within the framework of the Hartree-Fock approximation. Numerical calculations are carried out for the case of Ni 1- x Fe x . The results are in good agreement with the experimental data of the magnetic moments of Ni and Fe in concentrated alloys and also with the data of the electronic specific heat. The instability of the nonmagnetic state at a finite temperature is discussed by calculating the susceptibility in CPA. Possible experiments to check the calculated electronic structure are discussed. An extention to a degenerate (multiband) tight-binding model is also presented.read more
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The theory and properties of randomly disordered crystals and related physical systems
TL;DR: A review of the methods for determining the behavior of solids whose properties vary randomly at the microscopic level, with principal attention to systems having composition variation on a well-defined structure (random "alloys") can be found in this paper.
Journal ArticleDOI
Itinerant electron magnetism
TL;DR: The many theoretical studies of the various magnetic, thermal and magnetoelastic properties for paramagnetic and ferromagnetic transition metals and alloys in the simple itinerant electron model are reviewed in this article.
Journal ArticleDOI
Fast Korringa-Kohn-Rostoker coherent potential approximation and its application to FCC Ni-Fe systems
TL;DR: In this paper, a fast KKR CPA method is explained and its convergence properties are examined numerically, and it is shown that a step number of N 300, which determines the number of k-points used for the numerical integration in the k-space as well as a number of iteration steps in determining the coherent t-matrix, is sufficient for most purposes, including total energy calculations.
Journal ArticleDOI
Single-Site Functional-Integral Approach to Itinerant-Electron Ferromagnetism
TL;DR: In this paper, a functional-integral method with two fields within the static and saddle-point approximations combined with the single-site approximation was used to analyze the ferromagnetic properties of bcc transition metals.
Journal ArticleDOI
Magnetic amorphous alloys: physics and technological applications
TL;DR: A review of recent progress in research on magnetic amorphous alloys and critically assesses the present level of understanding of this new class of magnetic materials, focusing mostly on the transition metal-metalloid glasses as mentioned in this paper.
References
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Journal ArticleDOI
Electron correlations in narrow energy bands
TL;DR: In this paper, the Hartree-Fock approximation of the correlation problem for the d-and f-bands was applied to a simple, approximate model for the interaction of electrons in narrow energy bands.
Journal ArticleDOI
Coherent-Potential Model of Substitutional Disordered Alloys
TL;DR: In this paper, a substitutional alloy based on the concept of an effective or coherent potential was introduced, which, when placed on every site of the alloy lattice, will simulate the electronic properties of the actual alloy.
Journal ArticleDOI
Electron Correlation and Ferromagnetism of Transition Metals
TL;DR: In this paper, the electron correlation in a narrow energy band is discussed taking into account the multiple scattering between two electrons, and an approximate expression of the effective magnitude of the interaction is derived.
Journal ArticleDOI
Single-Site Approximations in the Electronic Theory of Simple Binary Alloys
TL;DR: In this paper, a single-band model Hamiltonian is used to describe the electronic structure of a three-dimensional disordered binary alloy, and several common theories based on the single-site approximation in a multiple-scattering description are compared with exact results for this Hamiltonian.
Journal ArticleDOI
Effect of Ferromagnetic Spin Correlations on Superconductivity
N. F. Berk,J. R. Schrieffer +1 more
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