Electronic States and Superconductivity in Multi-layer High-Tc Cuprates
Michiyasu Mori, Takami Tohyama, Sadamichi Maekawa
Abstract
We study electronic states of multilayer cuprates in the normal phases as functions of the number of CuO2 planes and the doping rate. The resonating valence bond wave function and the Gutzwiller approximation are used for a two-dimensional multilayer t-t'-t''-J model. We calculate the electron-removal spectral functions at (π,0) in the CuO2 plane next to the surface to understand the angle-resolved photoemission spectroscopy (ARPES) spectra. We find that the trilayer spectrum is narrower than the bilayer spectrum but is wider than the monolayer spectrum. In the tri- and tetralayer systems, the outer CuO2 plane has different superconducting amplitude from the inner CuO2 plane, while each layer in the bilayer systems has same amplitude. The recent ARPES and NMR experiments are discussed in the light of the present theory.
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