Quasiparticle bands and superconductivity in bilayer cuprates

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We analyze the generic features of the energy spectrum for two coupled CuO$_2$ layers with a realistic extended Hubbard model. The quasiparticle bands exhibit flat regions near X(Y) points in the Brillouin zone with a large reduction of the bonding-antibonding splitting, and pinning of extended van-Hove singularity to the Fermi level, which is more efficient for a bi-layers than for a single layer. In contrast to the results with simpler models, the superconducting temperature for d$_{x^2-y^2}$ pairing is not lowered by the bi-layer hopping.
Submitted to PRL, 4 pages, 5 eps-figures for Latex2e

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Condensed Matter

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http://salesiana.dossiersoluciones.com/handle/123456789/27359

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/cond-mat/9509101
 http://arxiv.org/abs/cond-mat/9509101

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arXiv