The $s^\pm$-Wave Superconductivity in the Pressurized La$_4$Ni$_3$O$_{10}$
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arXiv
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| Format: | Preprint |
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2024
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| author | Zhang, Ming Sun, Hongyi Liu, Yu-Bo Liu, Qihang Chen, Wei-Qiang Yang, Fan |
| author_facet | Zhang, Ming Sun, Hongyi Liu, Yu-Bo Liu, Qihang Chen, Wei-Qiang Yang, Fan |
| contents | Recently, evidence of superconductivity (SC) has been reported in pressurized La$_4$Ni$_3$O$_{10}$. Here we study the possible pairing mechanism and pairing symmetry in this material. Through fitting the density-functional-theory band structure, we provide a six-orbital tight-binding model. In comparison with the band structure of La$_3$Ni$_2$O$_7$, the additional non-bonding $d_{z^2}$ band is importance to the pairing mechanism here. When the multi-orbital Hubbard interactions are included, our random-phase-approximation based study yields an $s^{\pm}$-wave pairing. The dominant FS nesting with nesting vector $\mathbf{Q}_1\approx (π,π)$ is between the $γ$-pocket contributed by the bonding $d_{z^2}$ band top and the $α_1$-pocket contributed by the non-bonding $d_{z^2}$ band bottom, leading to the strongest pairing gap amplitude and opposite gap signs within the two regimes. The dominant real-space pairing is the interlayer pairing between the $d_{z^2}$ orbitals. We have also studied the doping dependence of the pairing symmetry and $T_c$. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2402_07902 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | The $s^\pm$-Wave Superconductivity in the Pressurized La$_4$Ni$_3$O$_{10}$ Zhang, Ming Sun, Hongyi Liu, Yu-Bo Liu, Qihang Chen, Wei-Qiang Yang, Fan Superconductivity Recently, evidence of superconductivity (SC) has been reported in pressurized La$_4$Ni$_3$O$_{10}$. Here we study the possible pairing mechanism and pairing symmetry in this material. Through fitting the density-functional-theory band structure, we provide a six-orbital tight-binding model. In comparison with the band structure of La$_3$Ni$_2$O$_7$, the additional non-bonding $d_{z^2}$ band is importance to the pairing mechanism here. When the multi-orbital Hubbard interactions are included, our random-phase-approximation based study yields an $s^{\pm}$-wave pairing. The dominant FS nesting with nesting vector $\mathbf{Q}_1\approx (π,π)$ is between the $γ$-pocket contributed by the bonding $d_{z^2}$ band top and the $α_1$-pocket contributed by the non-bonding $d_{z^2}$ band bottom, leading to the strongest pairing gap amplitude and opposite gap signs within the two regimes. The dominant real-space pairing is the interlayer pairing between the $d_{z^2}$ orbitals. We have also studied the doping dependence of the pairing symmetry and $T_c$. |
| title | The $s^\pm$-Wave Superconductivity in the Pressurized La$_4$Ni$_3$O$_{10}$ |
| topic | Superconductivity |
| url | https://arxiv.org/abs/2402.07902 |