Готові списки джерел за темами / Eliashberg equation

Добірка наукової літератури з теми "Eliashberg equation"

Автор: Grafiati

Опубліковано: 14 березня 2023

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Статті в журналах з теми "Eliashberg equation"

Cai, J., X. L. Lei, and L. M. Xie. "Vertex correction to the Eliashberg equation for the superconducting critical temperature." Physical Review B 39, no. 16 (June 1, 1989): 11618–23. http://dx.doi.org/10.1103/physrevb.39.11618.

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Wu, Hang-Sheng, Zheng-Yu Weng, Guangda Ji, and Zi-Fang Zhou. "Analytic solution to the Eliashberg equation for the superconducting critical temperatures." Journal of Physics and Chemistry of Solids 48, no. 5 (January 1987): 395–417. http://dx.doi.org/10.1016/0022-3697(87)90100-4.

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Dayan, Moshe. "Large energy gap solutions of the generalized eliashberg equation in high temperature superconductors." Physica C: Superconductivity 167, no. 1-2 (April 1990): 228–35. http://dx.doi.org/10.1016/0921-4534(90)90507-b.

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BASU, S., SUJIT SARKAR, and S. SIL. "PRESSURE COEFFICIENT OF THE SUPERCONDUCTING TRANSITION TEMPERATURE IN THE STRONG COUPLING LIMIT." Modern Physics Letters B 10, no. 18 (August 10, 1996): 839–43. http://dx.doi.org/10.1142/s021798499600095x.

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Анотація:

Pressure coefficient (β) of the superconducting transition temperature (T c ) for a two dimensional system is studied in presence of Coulomb interaction, using Eliashberg equation with the Einstein approximation for the phonon system, within the van Hove scenario. β is found to be high in the low-T c region and low in the high-T c region. β is positive in the underdoped region and becomes negative in the overdoped region. For a given value of Fermi energy, β increases in the underdoped region and decreases in the overdoped region with the increase of Coulomb repulsion.

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Zhao, G. L., and D. Bagayoko. "The Gap Function in YBa2Cu3O7." International Journal of Modern Physics B 12, no. 29n31 (December 20, 1998): 3057–62. http://dx.doi.org/10.1142/s0217979298002052.

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Анотація:

We have solved the four-dimensional anisotropic Eliashberg gap equation for YBa2Cu3O7 (YBCO) using the calculated electronic structure and the electron–phonon interaction matrix elements. The calculated T c for YBCO is about 89 K or μ*= 0.1. At or slightly above the transition temperature T c , the real part of the gap function Δ(k, 0), for all the k-points on the Fermi surface, becomes zero and the material is not superconducting. However, the energy gap function Δ(k,ω) is still nonzero for ω > 0 for some electronic states, leading to a pseudo-gap behavior in YBCO.

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ZHAO, G. L., and D. BAGAYOKO. "AB-INITIO CALCULATIONS OF SUPERCONDUCTING PROPERTIES OF YBa2Cu3O7." International Journal of Modern Physics B 13, no. 29n31 (December 20, 1999): 3579–81. http://dx.doi.org/10.1142/s0217979299003465.

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Анотація:

We present ab-initio calculations for the electronic structure and superconducting properties of YBa 2 Cu 3 O 7 (YBCO). The electronic structure was calculated using a self-consistent ab-initio LCAO method. We solved the anisotropic Eliashberg gap equation numerically. The strong coupling of the high energy optical phonons around 60-73 meV, with the electrons at the Fermi surface, leads to a high Tc in YBCO. The calculated Tc is about 89 K for μ*=0.1. The good agreement of the calculated results with experimental measurements and the ab-initio nature of the calculations support the scenario of an anisotropic s-wave superconductor for YBCO.

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Mineev-Weinstein, M. B. "Exact calculations of Tc from Eliashberg equation for simultaneous action of different channels of pairing." Physica C: Superconductivity 182, no. 4-6 (November 1991): 322–26. http://dx.doi.org/10.1016/0921-4534(91)90529-8.

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Feher, Alexander, S. B. Feodosyev, I. A. Gospodarev, V. I. Grishaev, K. V. Kravchenko, E. V. Manzhelii, and Eugenyi Syrkin. "Peculiarities of the Electron-Phonon Interaction in Graphite Containing Metallic Intercalated Layers." Defect and Diffusion Forum 297-301 (April 2010): 75–81. http://dx.doi.org/10.4028/www.scientific.net/ddf.297-301.75.

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The calculation of the local density of electronic states of graphene with vacancies, using the method of Jacobi matrix, was performed. It was shown that for atoms in the sublattice with a vacancy the local density of electronic states conserves the Dirac singularity, similarly as in an ideal graphene. A quasi-Dirac singularity was observed also in the phonon spectra of graphite for the atom displacements in the direction perpendicular to layers. Changes of phonon spectra of graphite intercalated with various metals were analyzed. On the basis of our results and using the BCS theory and Eliashberg equation we proposed what dynamic properties an intercalated graphite system should show to obtain an increased Tc.

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NISHIO, Yoshimasa, Masafumi SHIRAI, Naoshi SUZUKI, and Kazuko MOTIZUKI. "ELECTRON-PHONON INTERACTION, LATTICE DYNAMICS AND SUPERCONDUCTIVITY OF LAYERED TRANSITION-METAL DICHALCOGENIDE NbS2." International Journal of Modern Physics B 07, no. 01n03 (January 1993): 188–92. http://dx.doi.org/10.1142/s0217979293000421.

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Lattice dynamics of NbX 2( X = S , Se ) is studied by taking account of electron-phonon interaction derived microscopically on the basis of the realistic tight-binding bands fitted to the first-principle bands of NbX 2. Remarkable frequency renormalization of Σ1 phonon mode around [Formula: see text] is caused due to characteristic wave-vector and mode dependences of the electron-phonon interaction as well as nesting effect of Fermi surface. It is also shown that the short range force constant for neighboring X ions on different X-layers in the same X-Nb-X sandwich determines primarily whether lattice instability occurs ( NbSe 2 case) or does not occur ( NbS 2 case). By using the electron-phonon interaction and the lattice dynamics obtained for NbS 2 we have calculated the spectral function α2F(ω) and determined superconducting transition temperature T c by solving the linearlized Eliashberg equation. Renormalization of phonon frequencies due to the eletron-phonon interaction raises considerably the transition temperature and the obtained value of T c agrees in order of magnitude with the experimental data.

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Goto, Hiroki, and Yuhei Natsume. "Effects of the Vertex Correction by the Method of Nambu to the Eliashberg-Migdal Equation in the Strong Coupling Superconductivity under the Ultra-High Magnetic Field." Journal of the Physical Society of Japan 64, no. 8 (August 15, 1995): 3031–37. http://dx.doi.org/10.1143/jpsj.64.3031.

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Дисертації з теми "Eliashberg equation"

Johansson, Joakim, and Fredrik Lauren. "Efficient Computational Procedure for the Analytic Continuation of Eliashberg Equations." Thesis, Uppsala universitet, Institutionen för teknikvetenskaper, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-226315.

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Анотація:

The superconducting order parameter and the mass renormalization function can be solved either at discrete frequencies along the imaginary axis, or as a function of continuous real frequencies. The latter is done with a method called analytic continuation. The analytic continuation can conveniently be done by approximating a power series to the functions, the Padè approximation. Studied in this project is the difference between the Padè approximation, and a formally exact analytic continuation of the functions. As it turns out, the Padè approximant is applicable to calculate the superconducting order parameter at temperatures sufficiently below the critical temperature. However close to the critical temperature the approximation fails, while the solution presented in this report remains reliable.

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Частини книг з теми "Eliashberg equation"

Askerzade, Iman. "Anisotropic Eliashberg Equations and Influence of Multiband Effects." In Unconventional Superconductors, 95–140. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-22652-6_3.

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Тези доповідей конференцій з теми "Eliashberg equation"

Goto, H., and Y. Natsume. "A calculation of eliashberg equations for superconducting phases under the ultra-high magnetic field of strong coupling cases in 2 and 3 dimensional systems." In International Conference on Science and Technology of Synthetic Metals. IEEE, 1994. http://dx.doi.org/10.1109/stsm.1994.835845.

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