Discriminating Gap Symmetries of Superconducting La$_3$Ni$_2$O$_7$
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arXiv
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| Format: | Preprint |
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2025
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| _version_ | 1866912764196290560 |
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| author | Wang, Zhan Wang, Yuxin Jiang, Kun Hu, Jiangping Zhang, Fu-Chun |
| author_facet | Wang, Zhan Wang, Yuxin Jiang, Kun Hu, Jiangping Zhang, Fu-Chun |
| contents | The discovery of high-T$_c$ superconductor in Ruddlesden-Popper nickelate materials represented by La$_3$Ni$_2$O$_7$ has opened new directions in the quest for unconventional superconductivity. A central unresolved issue concerns the pairing symmetry of the superconducting order. In this paper, we model the superconducting order of La$_3$Ni$_2$O$_7$ using the established Fermi surface structure together with phenomenological pairing functions belonging to $s_\pm$ and $d$-wave symmetry classes, which are the leading possibilities in the current debate. We compute several experimentally accessible observables-including tunneling density of states, point contact spectroscopy, superfluid density, and Raman spectroscopy-each of which exhibits distinct characteristics for different gap symmetries. These quantities provide a concrete and experimentally testable route for identifying the pairing symmetry of La$_3$Ni$_2$O$_7$ and for clarifying the microscopic nature of nickelate superconductivity. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2512_12734 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Discriminating Gap Symmetries of Superconducting La$_3$Ni$_2$O$_7$ Wang, Zhan Wang, Yuxin Jiang, Kun Hu, Jiangping Zhang, Fu-Chun Superconductivity The discovery of high-T$_c$ superconductor in Ruddlesden-Popper nickelate materials represented by La$_3$Ni$_2$O$_7$ has opened new directions in the quest for unconventional superconductivity. A central unresolved issue concerns the pairing symmetry of the superconducting order. In this paper, we model the superconducting order of La$_3$Ni$_2$O$_7$ using the established Fermi surface structure together with phenomenological pairing functions belonging to $s_\pm$ and $d$-wave symmetry classes, which are the leading possibilities in the current debate. We compute several experimentally accessible observables-including tunneling density of states, point contact spectroscopy, superfluid density, and Raman spectroscopy-each of which exhibits distinct characteristics for different gap symmetries. These quantities provide a concrete and experimentally testable route for identifying the pairing symmetry of La$_3$Ni$_2$O$_7$ and for clarifying the microscopic nature of nickelate superconductivity. |
| title | Discriminating Gap Symmetries of Superconducting La$_3$Ni$_2$O$_7$ |
| topic | Superconductivity |
| url | https://arxiv.org/abs/2512.12734 |