Electron Correlation in High Temperature Cuprates

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.

DOI: 10.4236/jamp.2014.25010                

Abstract

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.

Keywords

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

Conflicts of Interest

The authors declare no conflicts of interest.

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