Mott transition in cuprate high-temperature superconductors

Abstract

In this study, we investigate the metal-insulator transition of charge transfer type in high-temperature cuprates. We first show that we must introduce a new band parameter in the three-band d-p model to reproduce the Fermi surface of high temperature cuprates such as BSCCO, YBCO and Hg1201. We present a new wave function of a Mott insulator based on the improved Gutzwiller function, and show that there is a transition from a metal to a charge-transfer insulator for such parameters by using the variational Monte Carlo method. This transition occurs when the level difference ${\Delta }_{dp}\equiv {\epsilon }_p-{\epsilon }_d$ between d and p orbitals reaches a critical value $({\Delta }_{dp}{)}_c$. The energy gain $\Delta E$, measured from the limit of large ${\Delta }_{dp}$, is proportional to $1/{\Delta }_{dp}$ for ${\Delta }_{dp}>({\Delta }_{dp}{)}_c$: $\Delta E\propto -t_{dp}^2/{\Delta }_{dp}$. We obtain $({\Delta }_{dp}{)}_c\simeq 2t_{dp}$ using the realistic band parameters.

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Cited by in corpus (7)

• Superconducting stripes in the hole-doped three-band Hubbard model
• Crossover from weakly to strongly correlated regions in the two-dimensional Hubbard model -- Off-diagonal wave function Monte Carlo studies of Hubbard model II --
• Superconductivity in the three-band model of cuprates: Variational wave function study and relation to the single-band case
• Mechanism of High-Temperature Superconductivity in Correlated-Electron Systems
• Superconducting properties of the hole-doped three-band \emph{d-p} model studied with minimal-size real-space \emph{d}-wave pairing operators
• Antiferromagnetism, Superconductivity and Phase Diagram in the Two-Dimensional Hubbard Model -- Off-Diagonal Wave Function Monte Carlo Studies of Hubbard Model III --
• Enhancement of superconductivity due to kinetic-energy effect in the strongly correlated phase of the two-dimensional Hubbard model