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- W170914253 abstract "We report the results of a calculation of the electron-phonon interaction in Y${mathrm{Ba}}_{2}$${mathrm{Cu}}_{3}$${mathrm{O}}_{7}$ based on the nonorthogonal tight-binding approach to lattice dynamics. A self-consistent local-density electronic-structure calculation was combined with a shell-model description of the phonon spectrum. The resulting interaction matrix was used to calculate the superconducting transition temperature from a solution of the Eliashberg equations in which the full $mathbf{k}$ dependence was retained. The transition temperature was found to be about 90 K, quite close to experiment. The oxygen isotope effect was investigated. We also calculated the $mathbf{k}$-dependent gap function at $T=0$. The gap shows significant variation between different sheets of the Fermi surface as well as dependence on $mathbf{k}$ on the individual sheets, but is nodeless. The quantity $frac{2ensuremath{Delta}}{{k}_{B}{T}_{c}}$ varies from 6.0 to 2.5 on the Fermi surface." @default.
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- W170914253 date "1994-10-01" @default.
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- W170914253 title "Phonons and superconductivity in YBa2Cu3O7" @default.
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- W170914253 doi "https://doi.org/10.1103/physrevb.50.9511" @default.
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