Physics – Condensed Matter
Scientific paper
1995-12-12
Physics
Condensed Matter
8 pages, revtex, 5 figures available on request from kuroki@izanagi.phys.s.u-tokyo.ac.jp , replaced because we have added re
Scientific paper
10.1103/PhysRevLett.76.4400
A possibility of the electronic origin of the high-temperature superconductivity in cuprates is probed with the quantum Monte Carlo method by revisiting the three-band Hubbard model comprising Cu$3d_{x^2-y^2}$ and O$2p_\sigma$ orbitals. The $d_{x^2-y^2}$ pairing correlation is found to turn into an increasing function of the repulsion $U_d$ within the $d$ orbitals or the $d$-$p$ level off-set $\Delta \varepsilon$, where the correlation grows with the system size. % and is long-ranged as also seen from a real-space analysis. We have detected this in both the charge-transfer and Mott-Hubbard regimes upon entering the strong-correlation region ($U_d$ or $\Delta \varepsilon >$ bare band width).
Aoki Hideo
Kuroki Kazuhiko
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