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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 paper, the Coulomb interaction between itinerant electrons is treated in the mean field approach and the disorder is dealt with the coherent potential approximation, and the calculated isothermal entropy changes and the adiabatic temperature changes upon magnetic field variations are in good agreement with the available experimental data.
10 citations
TL;DR: In this paper, the electronic structure of Fe2�xV1+xAl upon changing the content x was theoretically investigated from first principles by using the fully relativistic Dirac linear-muffin-tin-orbital band structure method and the scalar-relativistic Korringa-Kohn- Rostoker method within the coherent potential approximation generalized to treat disorder in multicomponent complex alloys.
Abstract: Soft x-ray absorption spectra and their x-ray magnetic circular dichroism XMCD have been theoretically studied at the transition-metal L2,3 thresholds of the Heusler-type Fe2�xV1+xAl. The electronic structure of Fe2�xV1+xAl upon changing the content x was theoretically investigated from first principles by using the fully relativistic Dirac linear-muffin-tin-orbital band structure method and the scalar relativistic Korringa–Kohn– Rostoker method within the coherent potential approximation generalized to treat disorder in multicomponent complex alloys. Densities of valence states and spin and orbital magnetic moments are analyzed and discussed. The origin of the XMCD spectra in the Fe2�xV1+xAl compound is examined. The calculated results are compared to the experimental data. DOI: 10.1103/PhysRevB.77.134444
10 citations
TL;DR: In this paper, an analytical quantum-statistical theory of giant magnetoresistance (GMR) in magnetic sandwiches for current in-plane geometry (CIP) is developed taking into account quantization of electron motion perpendicular to plane direction and spin-dependent reflection and scattering of conduction electrons at interfaces.
10 citations
TL;DR: In this paper, the possibility of ferromagnetic ordering is revisited in the band model by using the coherent potential approximation decoupling for the strong on-site Coulomb interaction.
Abstract: The possibility of ferromagnetic ordering is revisited in the band model. The coherent potential approximation decoupling has been used for the strong on-site Coulomb interaction. The driving forces towards the ferromagnetism are the on-site and inter-site molecular fields coming from different Coulomb interactions. Another driving force is the lowering of the kinetic energy with growing magnetic moment coming from the dependence of the hopping integrals on occupation of the neighboring sites involved in hopping. This effect is described by the hopping interaction, Δ t , and by what we call the exchange–hopping interaction, t ex . The exchange–hopping interaction, which is the difference in hopping integrals for different occupation of neighboring lattice sites, acts in a way analogous to the Hund's magnetic exchange interaction. The results are calculated for semi-elliptic density of states (DOS) and for the distorted semi-elliptic DOS with the maximum around the Fermi energy. They show a natural tendency towards the magnetic ordering at the end of the 3D row for the DOS with maximum density around the Fermi energy, when the hopping integrals grow with the occupation of the neighboring lattice sites.
10 citations
10 citations