scispace - formally typeset
Search or ask a question
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.


Papers
More filters
Journal ArticleDOI
TL;DR: The one-site multiple scattering is taken into account using a t-matrix formalism, and the exchange scattering via f spin correlation between different sites is treated using a two-spin correlation function and an appropriate decoupling scheme.
Abstract: For the s-f model in ferromagnetic semiconductors, it is necessary to treat simultaneously multiple scattering on the same site and scattering due to f spin correlation between different sites. In this paper, one-site multiple scattering is taken into account using a t-matrix formalism, and the exchange scattering via f spin correlation between different sites is treated using a two-spin correlation function and an appropriate decoupling scheme. The results show good agreement with those of the coherent potential approximation in the high-temperature limit. The calculated energy of the bottom of the band is reasonable, even at the Curie temperature (${\mathit{T}}_{\mathit{C}}$), for a wide range of IS/W, where W is the bandwidth of the conduction band and IS is the exchange interaction energy.

5 citations

Journal ArticleDOI
TL;DR: In this article, the magnetic and structural properties of a series of nonstoichiometric Ni-Mn-Ga Heusler alloys are theoretically investigated in terms of the density functional theory.
Abstract: The magnetic and structural properties of a series of nonstoichiometric Ni–Mn–Ga Heusler alloys are theoretically investigated in terms of the density functional theory. Nonstoichiometry is formed in the coherent potential approximation. Concentration dependences of the equilibrium lattice parameter, the bulk modulus, and the total magnetic moment are obtained and projected onto the ternary phase diagram of the alloys. The stable crystalline structures and the magnetic configurations of the austenitic phase are determined.

5 citations

Journal ArticleDOI
TL;DR: Using the Korring-Kohn-Rostoker (KKR) method combined with the coherent potential approximation (CPA) as mentioned in this paper, the electronic structure and magnetic properties of the doped and co-doped materials with single and double impurities were analyzed.
Abstract: Using the Korring–Kohn–Rostoker (KKR) method combined with the coherent potential approximation (CPA) we study the electronic structure and magnetic properties of the doped and co-doped of Ga1-x Co x N and Ga1-x-y Co x Cr y N materials with single and double impurities, respectively. The total and local density of state (DOS) in two systems are obtained We investigate the effect of the different values of dilution in Ga1-x Co x N and Ga1-x-y Co x Cr y N. On the other hand, the magnetic moment and the gap energies are deduced for different values of concentrations.

5 citations

Journal ArticleDOI
TL;DR: In this article, an extension of the CPA technique is presented to account for the long-range order of atoms and/or antiferromagnetic solutions for simple cubic or body centred cubic crystallographic structures.
Abstract: An extension of the CPA technique is presented to account for the long-range order of atoms and/or antiferromagnetic solutions for simple cubic or body centred cubic crystallographic structures. Numerical calculations indicate that the influence of the ordering of atoms on the density of states is small for Fe1-xNix alloys. The electronic energy shows that the non-ordered state is favourable. For Cr in antiferromagnetic state is obtained with energy close to the energy of the paramagnetic state. For Cr0.5Fe0.5 alloy the minimum of the free energy corresponds to the fully ordered state, which is a non-magnetic one.

5 citations

Journal ArticleDOI
TL;DR: In this article, it was shown that the degenerate three-center integrals of the electron-phonon matrix elements influence the coupling constant λ of a transition-metal alloy in a different manner.

5 citations


Network Information
Related Topics (5)
Magnetization
107.8K papers, 1.9M citations
91% related
Superconductivity
71.9K papers, 1.3M citations
90% related
Band gap
86.8K papers, 2.2M citations
87% related
Ground state
70K papers, 1.5M citations
85% related
Phase transition
82.8K papers, 1.6M citations
84% related
Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20234
202222
202127
202030
201930
201840