Effect of the Coulomb repulsion and oxygen level on charge distribution and superconductivity in the Emery model for cuprates superconductors

Abstract

The Emery model (aka the three-band Hubbard model) offers a simplified description of the copper-oxide planes that form the building blocks of high-temperature superconductors. By contrast with the even simpler one-band Hubbard model, it differentiates between copper and oxygen orbitals and thus between oxygen occupation ($n_p$) and copper occupation ($n_d$). Here we demonstrate, using cluster dynamical mean field theory, how the two occupations are related to the on-site Coulomb repulsion $U$ on the copper orbital and to the energy difference ${\epsilon }_p$ between oxygen and copper orbitals. Since the occupations ($n_p$ and $n_d$) have been estimated from NMR for a few materials (LCO, YBCO and NCCO), this allows us to estimate the value of $U-{\epsilon }_p$ for these materials, within this model. We compute the density of states for these and the effect of $(U,{\epsilon }_p)$ on the $n_d$-$n_p$ curve, superconductivity, and antiferromagnetism.

9 pages, 8 figures

References in corpus (8)

• Theory of Intertwined Orders in High Temperature Superconductors
• On the Electron Pairing Mechanism of Copper-Oxide High Temperature Superconductivity
• Relationship between the parent charge transfer gap and maximum transition temperature in cuprates
• Paramagnons and high-temperature superconductivity in mercury-based cuprates
• Distribution of electrons and holes in cuprate superconductors as determined from ${}^{17}$O and ${}^{63}$Cu nuclear magnetic resonance
• Pseudogap transition within the superconducting phase in the three-band Hubbard model
• Pyqcm: An open-source Python library for quantum cluster methods
• Ambipolar doping of a charge-transfer insulator in the Emery model

Cited by in corpus (1)

• Charge gap and charge redistribution among copper and oxygen orbitals in the normal state of the Emery model