Theoretical study of the electronic correlation and superconducting pairing in La$_{2.85}$Pr$_{0.15}$Ni$_2$O$_7$ film grown on SrLaAlO$_4$
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arXiv
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| Formato: | Preprint |
| Publicado: |
2025
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| _version_ | 1866911415464361984 |
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| author | Gao, Yi |
| author_facet | Gao, Yi |
| contents | We investigate the electronic correlation effects in La$_{2.85}$Pr$_{0.15}$Ni$_2$O$_7$ film grown on SrLaAlO$_4$ by fluctuation-exchange approximation. The $γ$ and $δ$ bands are found to shift down with correlation while their Fermi surfaces become highly damped and cannot to be resolved experimentally. In contrast, the $α$ and $β$ Fermi surfaces do not vary much with correlation and they are sharp enough to be detected in experiments. The spin susceptibility peaks at a wave vector in the odd channel, connecting the symmetric $γ$ band and the asymmetric $δ$ band. The superconducting pairing symmetry is robustly $s$-wave and the $δ$ band has the largest pairing magnitude. All the findings suggest a dominant role of the $3d_{z^{2}}$ orbital in this material. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2507_19784 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Theoretical study of the electronic correlation and superconducting pairing in La$_{2.85}$Pr$_{0.15}$Ni$_2$O$_7$ film grown on SrLaAlO$_4$ Gao, Yi Superconductivity We investigate the electronic correlation effects in La$_{2.85}$Pr$_{0.15}$Ni$_2$O$_7$ film grown on SrLaAlO$_4$ by fluctuation-exchange approximation. The $γ$ and $δ$ bands are found to shift down with correlation while their Fermi surfaces become highly damped and cannot to be resolved experimentally. In contrast, the $α$ and $β$ Fermi surfaces do not vary much with correlation and they are sharp enough to be detected in experiments. The spin susceptibility peaks at a wave vector in the odd channel, connecting the symmetric $γ$ band and the asymmetric $δ$ band. The superconducting pairing symmetry is robustly $s$-wave and the $δ$ band has the largest pairing magnitude. All the findings suggest a dominant role of the $3d_{z^{2}}$ orbital in this material. |
| title | Theoretical study of the electronic correlation and superconducting pairing in La$_{2.85}$Pr$_{0.15}$Ni$_2$O$_7$ film grown on SrLaAlO$_4$ |
| topic | Superconductivity |
| url | https://arxiv.org/abs/2507.19784 |