Abstract
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 and O orbitals. The pairing correlation is found to turn into an increasing function of the repulsion within the orbitals or the - level offset , where the normalized correlation grows with the system size. We have detected this in both the charge-transfer and Mott-Hubbard regimes upon entering the strong-correlation region ( or bare bandwidth).
- Received 6 December 1995
DOI:https://doi.org/10.1103/PhysRevLett.76.4400
©1996 American Physical Society