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- W2255683920 abstract "The interaction between two electrons near a conducting and polarizable plane is found to be attractive at large separations if the polarizability is large enough. Assuming such an interaction, a variational Bardeen-Cooper-Schrieffer superconducting state is constructed based upon the Y${mathrm{Ba}}_{2}$${mathrm{Cu}}_{3}$${mathrm{O}}_{7}$ tight-binding electronic structure. There is no charge-density-wave instability, nor $s$-wave superconducting instability. However, allowing the phase of the order parameter to vary along the Fermi lines separates the paired electrons sufficiently to sample only the attractive electron-electron interaction. As the polarizability is increased from zero over a reasonable range, 90-K superconductivity is first obtained in the Cu${mathrm{O}}_{2}$ planes. The corresponding Cooper-pair electrons are related by a reflection symmetry of the Brillouin zone rather than the usual $mathbf{k}$ to $ensuremath{-}mathbf{k}$ inversion. The paired electrons move along third-neighbor copper rows. This particular $l=3$ state would have triplet pairing but neighboring $l=2$ and $l=4$ superconducting states have singlet pairing. Superconductivity, with a smaller gap, simultaneously arises on the Cu${mathrm{O}}_{3}$ chains with Cooper-pair electrons on second-neighbor chains. The ratio $frac{2{ensuremath{Delta}}_{0}}{{k}_{B}{T}_{c}}$ is found to be 5.08 for the planes. Predicted values for a range of superconducting properties of the 90-K state are in reasonable accord with experiment." @default.
- W2255683920 created "2016-06-24" @default.
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- W2255683920 date "1988-07-01" @default.
- W2255683920 modified "2023-09-25" @default.
- W2255683920 title "Superconductivity on a YBa2Cu3O7lattice" @default.
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- W2255683920 doi "https://doi.org/10.1103/physrevb.38.270" @default.
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