Possible explanation for the absence of bilayer splitting in YBCO

1997/07/04 by H. Monien, N. Elstner, Monien, H. +4
Engineering · Physics and Astronomy · #Physics of Superconductivity and Magnetism #Superconducting Materials and Applications #cond-mat.str-el

paper · pdf · doi:10.48550/arxiv.cond-mat/9707051

4 pages, RevTeX, 4 eps figures

arxiv created 1997/07/04 · arxiv updated 2009/11/30

Abstract

It has been claimed that the absence of the bilayer splitting in the high-temperature superconductor YBCO is a strong experimental indication that there are no coherent quasiparticles present in the CuO planes. We study a pair of strongly correlated planes which are connected by a hopping transfer integral t_⊥ in the limit of large in-plane coordination number. The effect of the correlation is incorporated in a dynamical mean-field theory, where the Weiss field is determined by a two-site Hubbard Hamiltonian. We have solved this problem by numerical techniques and present results for the spectral function ρ for relevant parameters of the model. For small t_⊥ we find the coherent hoping between planes to be proportional to the in-plane quasiparticle renormalisation.

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