Author(s)

Takashi Yanagisawa^1*, Mitake Miyazaki², Kunihiko Yamaji¹

¹Electronics and Photonics Research Institute, National Institute of Advanced Industrial Science and Technology, 1-1-1 Umezono, Tsukuba, Japan.
²Hakodate National College of Technology, 14-1 Tokura, Hakodate, Japan.

Electron correlation plays a key role in high-temperature cuprate superconductors. Material-parameter dependence of cuprates is important to clarify the mechanism of high temperature superconductivity. In this study, we examine the ground state of the three-band Hubbard model (d-p model) that explicitly includes oxygen p orbitals. We consider the half-filled case with the large
on-site Coulomb repulsion Ud by using the variational Monte Carlo method. The ground state is insulating when Ud is large at half-filling. The ground state undergoes a transition from a metal to a Mott insulator when the level difference εp-εd is increased.

High-Temperature Superconductor, Electron Correlation, Mott Insulator, Metal-Insulator Transition, Charge-Transfer Insulator

Yanagisawa, T. , Miyazaki, M. and Yamaji, K. (2014) Electron Correlation in High Temperature Cuprates. Journal of Applied Mathematics and Physics, 2, 72-76. doi: 10.4236/jamp.2014.25010.