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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01 Jan 1979
TL;DR: In this paper, the authors review some of the difficulties encountered in the solution of the KKR-CPA equations and the numerical techniques developed to overcome them, and present some numerical techniques to overcome these difficulties.
Abstract: In this lecture, we review some of the difficulties encountered in the solution of the KKR-CPA equations and the numerical techniques developed to overcome them.
8 citations
TL;DR: In this article, the role of the interfaces in the magnetoresistance of a spin-polarized screened Korringa-Kohn-Rostoker (KKR) system is investigated.
Abstract: By using the fully relativistic spin-polarized screened Korringa-Kohn-Rostoker method and the corresponding Kubo-Greenwood equation resistivities and the giant magnetoresistance are evaluated for Fe/Au/Fe/Au spin valves assuming both bcc-like Fe and fcc-Au leads. The theoretically obtained values for a spacer thickness of 7 monolayers of Au are in a rather good agreement with the corresponding experimental data. These data, in particular the temperature dependence of the resistivities reported in here, are analyzed with respect to the experimental setup and related to the theoretical models assumed. Since in the theoretical calculations interdiffused interfaces are taken into account by means of the inhomogeneous coherent potential approximation, the role of the interfaces in the magnetoresistance of this system can be discussed rigorously.
8 citations
TL;DR: In this article, the ab-initio calculations based on the Korringa Kohn Rostoker approximation approach combined with coherent potential approximation (KKR-CPA) were used to study the magnetic properties of the titanium anti-site (Ti O ) and chromium (Cr) doped TiO 2.
8 citations
TL;DR: In this paper, the coherent potential approximation is applied to a study of the DC electrical conductivity at zero temperature of disordered ternary alloys, where a semielliptical density of states is used for numerical purposes.
Abstract: The coherent potential approximation is applied to a study of the DC electrical conductivity at zero temperature of disordered ternary alloys. In the model a semielliptical density of states is used for numerical purposes. The comparison between the conductivities of binary alloys and the corresponding, in some sense, ternary alloy is given as well as the discussion of the influence of the parameters describing ternary alloys on the DC electrical conductivity.
8 citations
TL;DR: In this paper, the influence of disorder (impurities) on the electronic properties of heavy fermion systems, which are described by the periodic Anderson model (PAM), was investigated.
Abstract: We investigate the influence of disorder (impurities) on the electronic (transport) properties of heavy fermion systems, which are described by the periodic Anderson model (PAM). In this paper we consider disorder within the conduction band. The PAM is mapped onto an effective single impurity Anderson model (SIAM) by dynamical mean-field theory (DMFT), and the modified perturbation theory (MPT)—an approximation that is exact up to second order in the Coulomb correlation U and reproduces the atomic limit—is used for the effective SIAM. To include the scattering by the impurities we use the coherent potential approximation (CPA) which is consistent with the DMFT. For various concentrations c of the impurities we calculate the resistivity as well as the thermoelectrical power in a situation describing a Kondo insulator in the pure case ( c = 0 ).
8 citations