Strength of the interactions in $YBa_2Cu_3O_{6.7}$ obtained from the inelastic neutron-scattering measurements

TL;DR

This paper combines inelastic neutron scattering and ARPES data to quantify the interaction strengths in the cuprate superconductor YBa2Cu3O6.7, providing insights into the pairing mechanisms underlying high-temperature superconductivity.

Contribution

It introduces a method to determine the interaction parameters U, V, and J in the t-U-V-J model using experimental data on YBa2Cu3O6.7.

Findings

Quantified the on-site repulsive interaction U.

Estimated the spin-independent attractive interaction V.

Determined the antiferromagnetic interaction J.

Abstract

It is widely accepted that: (i) the angle-resolved photoemission spectroscopy (ARPES) data produce evidences for the opening of a d-wave pairing gap in cuprates compounds described at low energies and temperatures by a BCS theory, and (ii) the basic pairing mechanism arises from the antiferromagnetic exchange correlations, but the charge fluctuations associated with double occupancy of a site also play an essential role in doped systems. The simplest model that is consistent with the two statements is the $t$-$U$-$V$-$J$ model. We have shown that the inelastic neutron scattering data on $YBa_2Cu_3O_{6.7}$ [Phys. Rev. Lett. \textbf{83}, 608 (1999)] combined with the corresponding ARPES data allow us to obtain the strength of the on-site repulsive interaction $U$, as well as the strengths of the spin-independent attractive interaction $V$ and the spin-dependent antiferromagnetic interaction $J$.