Superconductivity in monolayer-trilayer phase of La$_3$Ni$_2$O$_7$ under high pressure
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arXiv
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2025
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| _version_ | 1866912646000803840 |
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| author | Huang, Chaoxin Li, Jingyuan Huang, Xing Zhang, Hengyuan Hu, Deyuan Huo, Mengwu Chen, Xiang Chen, Zhen Sun, Hualei Wang, Meng |
| author_facet | Huang, Chaoxin Li, Jingyuan Huang, Xing Zhang, Hengyuan Hu, Deyuan Huo, Mengwu Chen, Xiang Chen, Zhen Sun, Hualei Wang, Meng |
| contents | The discovery of 80 K superconductivity in pressurized bilayer Ruddlesden-Popper (RP) nickelate La$_3$Ni$_2$O$_7$ has established a new high-temperature superconductor family. The quest to understand the governing principles of RP nickelate superconductivity has become a central focus in condensed matter physics. Here, we report a critical advance by synthesizing and investigating a distinct structural polymorph of the same compound: the monolayer-trilayer (1313) hybrid phase of La$_3$Ni$_2$O$_7$. Under high pressure, synchrotron X-ray diffraction and Raman spectroscopy reveal a structural transition from the orthorhombic $Cmmm$ to the tetragonal $P4/mmm$ space group at 13~GPa. Above 19 GPa, the phase exhibits a clear superconducting transition, confirmed by a zero-resistance state, albeit at a significantly reduced temperature of 3.6 K. The stark contrast with the 80 K transition in the bilayer phase provides a uniquely clean experimental comparison. Our results demonstrate that the superconducting transition temperature is directly governed by the nature of the interlayer coupling, and the bilayer NiO$_6$ block as the essential structural motif for achieving high-$T_\text{c}$ superconductivity in the RP nickelates. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2510_12250 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Superconductivity in monolayer-trilayer phase of La$_3$Ni$_2$O$_7$ under high pressure Huang, Chaoxin Li, Jingyuan Huang, Xing Zhang, Hengyuan Hu, Deyuan Huo, Mengwu Chen, Xiang Chen, Zhen Sun, Hualei Wang, Meng Superconductivity The discovery of 80 K superconductivity in pressurized bilayer Ruddlesden-Popper (RP) nickelate La$_3$Ni$_2$O$_7$ has established a new high-temperature superconductor family. The quest to understand the governing principles of RP nickelate superconductivity has become a central focus in condensed matter physics. Here, we report a critical advance by synthesizing and investigating a distinct structural polymorph of the same compound: the monolayer-trilayer (1313) hybrid phase of La$_3$Ni$_2$O$_7$. Under high pressure, synchrotron X-ray diffraction and Raman spectroscopy reveal a structural transition from the orthorhombic $Cmmm$ to the tetragonal $P4/mmm$ space group at 13~GPa. Above 19 GPa, the phase exhibits a clear superconducting transition, confirmed by a zero-resistance state, albeit at a significantly reduced temperature of 3.6 K. The stark contrast with the 80 K transition in the bilayer phase provides a uniquely clean experimental comparison. Our results demonstrate that the superconducting transition temperature is directly governed by the nature of the interlayer coupling, and the bilayer NiO$_6$ block as the essential structural motif for achieving high-$T_\text{c}$ superconductivity in the RP nickelates. |
| title | Superconductivity in monolayer-trilayer phase of La$_3$Ni$_2$O$_7$ under high pressure |
| topic | Superconductivity |
| url | https://arxiv.org/abs/2510.12250 |