2023/10/18 by Zhihui Luo, Luo, Zhihui, Dao‐Xin Yao +3
Materials Science · Physics and Astronomy · #FOS: Physical sciences #Iron-based superconductors research #Magnetic and transport properties of perovskites and related materials #Physics of Superconductivity and Magnetism #Superconductivity (cond-mat.supr-con)
paper · pdf · doi:10.48550/arxiv.2310.12250
openalex publication_date 2023/10/18 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
The pairing symmetry in infinite-layer nickelate superconductors has been an intriguing problem under heated debates. In this work, we study a two-orbital Hubbard model with one strongly correlated 3d orbital and one more itinerant 5d orbital, by using an eight-site cellular dynamic mean field theory study. We establish a superconducting phase diagram with dx2-y2, s± and d+is wave pairing symmetries, based on which we clarify the roles of various relevant parameters including hybridization V, itinerant carrier density ⟨ nc⟩ and interaction Uc. We show that the inclusion of a less correlated 5d band in general suppresses the dx2-y2 wave pairing. We demonstrate that the d+is wave is maximized when the 5d orbital has a large Coulomb repulsion with intermediate hybridization parameter. We perform fluctuation diagnostics to show that the driving force behind the dx2-y2 wave is the intraband antiferromagnetic fluctuations in the 3d orbital, while for the s± wave, the pairing is mainly from the antiferromagnetic correlations residing on the local 3d-5d bond in real space.