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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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TL;DR: In this article, a theory for describing the effects of annealing magnetic alloys in magnetic fields is presented, which has an ab initio spin-polarized relativistic Korringa-Kohn- Rostoker coherent potential approximation (KKR-CPA) electronic structure basis.
Abstract: A theory is presented for describing the effects of annealing magnetic alloys in magnetic fields. It has an ab initio spin-polarized relativistic Korringa–Kohn– Rostoker coherent potential approximation (KKR-CPA) electronic structure basis and uses the framework of concentration waves. Alloys which would otherwise be soft magnets are found experimentally to develop directional chemical order and significant uniaxial anisotropy when annealed in magnetic fields. Our approach is able to provide a quantitative description of these effects together with the underlying electronic mechanisms. We describe applications to the soft magnetic alloys permalloy and FeCo.
5 citations
TL;DR: In this article, the influence of chemical disorder, such as vacancy defects on Li and O as well as Co/Ni/Mn alloying, on electronic density of states has been analyzed focusing on the magnetic properties onset in the aforementioned materials.
5 citations
TL;DR: In this paper, the authors considered the case of bosons in two dimensions in a random field, when the random field can be large compared to the repulsive exciton-exciton interaction energy, but is small compared to exciton binding energy.
5 citations
TL;DR: In this article, the influence of chemical disorder on the unoccupied electronic density of states of NiMnSb(0 0 1) was studied using the ab initio coherent potential approximation method.
Abstract: The half-Heusler alloy NiMnSb is one of the local-moment ferromagnets with unique properties for future applications. Band structure calculations exclusively predict majority bands at the Fermi level, thus indicating 100% spin polarization there. For the development of functional materials, chemical disorder has to be considered quantitatively. The magnetization, spin polarization and electronic structure are expected to be sensitive to structural and stoichiometric changes. We studied the influence of chemical disorder on the unoccupied electronic density of states of NiMnSb(0 0 1) by the use of the ab initio coherent potential approximation method and results are discussed along with corresponding measurements.
5 citations
TL;DR: In this article, it is shown how the coherent potential approximation (CPA) can be extended to describe the properties of paramagnetic alloys, and the results presented here differ from those of the single impurity approximation.
Abstract: It is shown how the coherent potential approximation (CPA) can be extended to describe the properties of paramagnetic alloys. The properties of conduction electrons are discussed. Even at very low concentrations of magnetic impurities, results presented here differ from those of the single impurity approximation. As an example the temperature dependence of the resistivity of alloys in the s–d exchange model is analysed. For T much lower than the Kondo temperature, T2 behaviour of the resistivity is derived, which then goes through a more or less pronounced linear region to logarithmic dependence for temperatures higher than TK.
Es wird die Koharent-Potential-Approximation erweitert, um die Eigenschaften paramagnetischer Legierungen beschreiben zu konnen, und es werden die Eigenschaften der Leitungselektronen diskutiert. Sogar bei sehr kleinen Konzentrationen magnetischer Verunreinigungen weichen die erhaltenen Ergebnisse von denen in der Approximation einfacher Storstellen ab. Als Beispiel wird im s–d-Austauschmodell die Temperaturabhangigkeit des spezifischen Widerstandes der Legierungen behandelt. Fur Temperaturen T viel kleiner als die Kondo-Temperatur TK wird ein T2-Verhalten des spezifischen Widerstandes erhalten. Bei hoheren Temperaturen schliest sich ein mehr oder weniger ausgedehnter linearer Bereich an, und dieser mundet fur T > TK: in eine logarithmische Abhangigkeit ein.
5 citations