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.

References in corpus (6)

• Orbital currents in extended Hubbard models of high-T${}_c$ cuprates
• Mott Transitions and d-wave Superconductivity in Half-Filled-Band Hubbard Model on Square Lattice with Geometric Frustration
• Incommensurate Antiferromagnetism Coexisting with Superconductivity in Two-Dimensional d-p Model
• Phase diagram of the t-U^2 Hamiltonian of the weak coupling Hubbard model
• Enhanced pair-correlation functions in the two-dimensional Hubbard model
• Quantum Monte Carlo diagonalization for many-fermion systems

Cited by in corpus (4)

• Crossover from weakly to strongly correlated regions in the two-dimensional Hubbard model -- Off-diagonal wave function Monte Carlo studies of Hubbard model II --
• Mechanism of High-Temperature Superconductivity in Correlated-Electron Systems
• 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