High-T_c Superconductivity and Shadow State Formation in YBa_{2}Cu_{3}O_{6+δ} and Bi_{2}Sr_{2}CaCu_{2}O_{8+δ}

Details High-T_c Superconductivity and Shadow State Formation in YBa_{2}Cu_{3}O_{6+δ} and Bi_{2}Sr_{2}CaCu_{2}O_{8+δ} High-T_c Superconductivity and Shadow State Formation in YBa_{2}Cu_{3}O_{6+δ} and Bi_{2}Sr_{2}CaCu_{2}O_{8+δ}

1996-09-11

arxiv.org/abs/cond-mat/9609099v1

Physics

Condensed Matter

Superconductivity

5 pages, Revtex, 5 postscript figures

Scientific paper

10.1016/S0038-1098(96)00651-5

The normal and superconducting state of YBa_{2}Cu_{3}O_{6+\delta} and Bi_{2}Sr_{2}CaCu_{2}O_{8+\delta} are investigated by using the mono- and bilayer Hubbard model within the fluctuation exchange approximation and a proper description of the Fermi surface topology. The inter- and intra-layer interactions, the renormalization of the bilayer splitting and the formation of shadow bands are investigated in detail. Although the shadow states are not visible in the monolayer, we find that the additional correlations in bilayers boost the shadow state intensity and will lead to their observability. In the superconducting state we find a $d_{x^2-y^2}$ symmetry of the order parameter and demonstrate the importance of inter-plane Copper pairing.

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