Identifying the structure of La3Ni2O7 in the pressurized superconducting state
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arXiv
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| Autori principali: | , , , , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| _version_ | 1866911276422135808 |
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| author | Zhang, Hengyuan Zhang, Jielong Huo, Mengwu Chen, Junfeng Hu, Deyuan Yao, Dao-Xin Sun, Hualei Cao, Kun Wang, Meng |
| author_facet | Zhang, Hengyuan Zhang, Jielong Huo, Mengwu Chen, Junfeng Hu, Deyuan Yao, Dao-Xin Sun, Hualei Cao, Kun Wang, Meng |
| contents | The precise crystal structure of La3Ni2O7 in its high-pressure superconducting state has been a subject of intense debate, with proposed models including both orthorhombic and tetragonal symmetries. Using high-pressure Raman spectroscopy combined with frst-principles calculations, we unravel the structural evolution of La3Ni2O7 under pressure up to 32.7 GPa. We identify a clear structural transition sequence: from the orthorhombic Amam phase to a mixed Amam+Fmmm phase at 4 GPa, followed by a complete transition to the tetragonal I4/mmm phase at 14.5 GPa, which is signaled by a pronounced phonon renormalization. The emergence of bulk superconductivity is found to coincide precisely with this transition to the I4/mmm phase. Our results de nitively establish the tetragonal I4/mmm structure as the host of superconductivity in La3Ni2O7, resolving a central controversy and providing a critical foundation for understanding the superconducting mechanism in nickelates. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2511_15265 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Identifying the structure of La3Ni2O7 in the pressurized superconducting state Zhang, Hengyuan Zhang, Jielong Huo, Mengwu Chen, Junfeng Hu, Deyuan Yao, Dao-Xin Sun, Hualei Cao, Kun Wang, Meng Superconductivity Strongly Correlated Electrons The precise crystal structure of La3Ni2O7 in its high-pressure superconducting state has been a subject of intense debate, with proposed models including both orthorhombic and tetragonal symmetries. Using high-pressure Raman spectroscopy combined with frst-principles calculations, we unravel the structural evolution of La3Ni2O7 under pressure up to 32.7 GPa. We identify a clear structural transition sequence: from the orthorhombic Amam phase to a mixed Amam+Fmmm phase at 4 GPa, followed by a complete transition to the tetragonal I4/mmm phase at 14.5 GPa, which is signaled by a pronounced phonon renormalization. The emergence of bulk superconductivity is found to coincide precisely with this transition to the I4/mmm phase. Our results de nitively establish the tetragonal I4/mmm structure as the host of superconductivity in La3Ni2O7, resolving a central controversy and providing a critical foundation for understanding the superconducting mechanism in nickelates. |
| title | Identifying the structure of La3Ni2O7 in the pressurized superconducting state |
| topic | Superconductivity Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2511.15265 |