Quasiparticle bands and superconductivity for the multiple-layer and three-dimensional superlattice t-J models

Abstract

We present a propagator-matrix approach to calculate the one-hole spectrum for the multiple-layer and three-dimensional (3D) superlattice t-J models using the self-consistent Born approximation and then obtain the superconducting transition temperature Tc within the antiferromagnetic van Hove scenario. The flat region around k‖=(π,0) in each band of the quasiparticle is observed for a trilayer and a 3D superlattice with a bilayer per unit cell, while strong many-body effects give rise to a large reduction of the band splitting. It is found that for a trilayer the outer planes are slightly less doped than the inner ones and for a 3D bilayer cuprate one can observe little dispersion along kz, in agreement with recent experimental data. Our calculations for rather different lattice structures and boundary conditions indicate that a large density of states leading to the boost of Tc mainly results from the in-plane antiferromagnetic correlations rather than from the band effects.

Source-reported materials — not catalogue approval

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