1995/09/16 by A. I. Liechtenstein, Liechtenstein, A. I., O. Gunnarsson +6
Materials Science · Physics and Astronomy · #Condensed Matter (cond-mat) #Copper-based nanomaterials and applications #FOS: Physical sciences #Physics of Superconductivity and Magnetism #Theoretical and Computational Physics #cond-mat
paper · pdf · doi:10.48550/arxiv.cond-mat/9509101
Submitted to PRL, 4 pages, 5 eps-figures for Latex2e
arxiv created 1995/09/16 · openalex publication_date 1995/09/16 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We analyze the generic features of the energy spectrum for two coupled CuO2 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 dx2-y2 pairing is not lowered by the bi-layer hopping.