Stability of the d-wave pairing with respect to the intersite Coulomb repulsion in cuprate superconductors

TL;DR

This study investigates how intersite Coulomb repulsion affects d-wave pairing in cuprate superconductors, finding that realistic interaction strengths do not suppress the pairing, thus supporting its stability.

Contribution

The paper demonstrates that d-wave pairing remains stable against typical intersite Coulomb interactions in the spin-fermion model for cuprates.

Findings

d-wave pairing is suppressed only at unphysically large Coulomb interactions

Intersite Coulomb interactions do not significantly affect pairing at realistic values

Supports the robustness of d-wave pairing in cuprate superconductors

Abstract

Within the spin-fermion model for cuprate superconductors, the influence of the intersite Coulomb interactions $V_2$ and $V_2'$ between holes located at the next-nearest-neighbor oxygen ions of CuO$_2$ plane on the implementation of the d_{x^2-y^2}-wave pairing is studied. It is shown that d-wave pairing can be suppressed only for unphysically large values of $V_2$ and $V_2'$.