Comparison of superconducting pairing in doped cuprates and nickelates within the Hubbard model including the third-nearest neighbor hopping terms

Abstract

Within a Hubbard model, we investigate the superconducting pairing behavior of infinite-layer nickelate NdNiO2 and cuprate superconductors by using the determinant quantum Monte Carlo method. Our focus is on comparing their dominant pairing symmetries. The results indicate that the dx2−y2 pairing interaction is significantly enhanced at low temperatures in both doped nickelates and cuprates, whereas other typical pairing symmetries are effectively suppressed, highlighting the dominance of the dx2−y2 pairing form. Additionally, we find that the effective pairing interaction for dx2−y2 pairing in doped nickelates is slightly lower than that in doped cuprates, which may be attributed to the different degrees of Fermi surface warping caused by the third-nearest hopping t′′. Further studies show that the hole doping and interaction strength have significant effects on the dx2−y2 pairing interaction within the selected parameter range. The dx2−y2 pairing interaction is notably weakened when the hole doping increases, whereas it is significantly enhanced with increasing Coulomb interaction strength U. This comparative analysis reveals the similarities and differences in the pairing behaviors of doped nickelates and cuprates, which may provide further insights into understanding the superconducting properties of these two classes of materials.

Source-reported materials — not catalogue approval

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