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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, the authors investigated the thermal depinning of flux lines on the irreversibility line from a viewpoint of thermodynamics using the coherent potential approximation theory, a kind of statistical theory for flux pinning.
Abstract: The thermal depinning of flux lines on the irreversibility line is investigated from a viewpoint of thermodynamics using the coherent potential approximation theory, a kind of statistical theory for flux pinning. The effect of thermal activation is approximately introduced by making the pinning potential shallow following the theoretical scheme by Yamafuji et al. It is shown that the thermal depinning is the transition of the second order. Since the vortex glass–liquid transition, which is considered to be identical with the thermal depinning, is originally predicted to be the second-order transition, the present theoretical result is reasonable. The present result also suggests that the irreversibility line observed at higher temperatures and at lower fields than the critical point for weakly pinned superconductors is also the transition line of the second order. In addition, it is shown that the degree of disorder of the flux line lattice decreases fast, suggesting a quick recovery of the order of the lattice with elevating temperature above the critical temperature.

16 citations

Journal ArticleDOI
TL;DR: In this article, an analytical and systematic numerical study of the nonlocal coherentpotential approximation (NLCPA) is presented for a one-dimensional tight-binding model Hamiltonian, and comparisons with the embedded cluster method (ECM) and molecular coherent potential approximation (MCPA) are made.
Abstract: Recently the nonlocal coherent-potential approximation (NLCPA) has been introduced by Jarrell and Krishnamurthy for describing the electronic structure of substitutionally disordered systems. The NLCPA provides systematic corrections to the widely used coherent-potential approximation (CPA) whilst preserving the full symmetry of the underlying lattice. Here an analytical and systematic numerical study of the NLCPA is presented for a one-dimensional tight-binding model Hamiltonian, and comparisons with the embedded cluster method (ECM) and molecular coherent potential approximation (MCPA) are made.

16 citations

Journal ArticleDOI
TL;DR: In this article, the electronic band structure of the InP-lattice matched alloys In0.53Ga0.47As and In 0.52Al0.48As is investigated using a non-local empirical pseudopotential including spin-orbit interaction.
Abstract: The electronic band structure of the InP-lattice matched alloys In0.53Ga0.47As and In0.52Al0.48As is investigated using a non-local empirical pseudopotential including spin–orbit interaction. Pseudopotential parameters are obtained by fitting the virtual crystal band structure immediately to available experimental data for the alloys. Results are presented for the band structures and effective masses in In0.53Ga0.47As and In0.52Al0.48As. Comparison of the band structures is made against available results from a quasiparticle calculation and a model pseudopotential calculation within the coherent potential approximation.

16 citations

Journal ArticleDOI
TL;DR: In this paper, first principles of transport properties of disordered alloys based on the Kubo-Greenwood formalism and the spin-polarized Korringa-Kohn-Rostoker coherent potential approximation are presented.
Abstract: First-principles calculations of transport properties of disordered alloys based on the Kubo-Greenwood formalism and the spin-polarized Korringa-Kohn-Rostoker coherent potential approximation are presented. Application to the fcc alloy systems NixCr12x and NixCu12x yields results for the residual resistivity, anomalous magnetoresistance, and the magnetic moments that are in very satisfying agreement with experiment. In particular, the different sign for the resistance anisotropy in Ni xCr12x and NixCu12x and the concentration of the onset of magnetism could be reproduced. Scalar-relativistic calculations were performed on the basis of the two-current model in order to assess the importance of relativistic effects in these systems.

16 citations

Journal ArticleDOI
TL;DR: Using the nonlocal coherent potential approximation, it is shown that the resonance peak both broadens and shifts as a function of impurity concentration.
Abstract: Recent STM experiments on Bi2Sr2Ca2Cu3O10 observed sharp bound states associated with Zn and Ni impurities, as previously predicted theoretically. Here we extend the theory to the case of a finite concentration of impurities. Using the nonlocal coherent potential approximation, we show that the resonance peak both broadens and shifts as a function of impurity concentration.

16 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20234
202222
202127
202030
201930
201840