Spin density wave rather than tetragonal structure is prerequisite for superconductivity in La3Ni2O7-δ
The pressure-induced high-temperature (T<sub>c</sub>) superconductivity in nickelates La<sub>3</sub>Ni<sub>2</sub>O<sub>7-δ</sub> has sparked significant interest to explore its superconductivity at ambient pressure. Whether the pressure-stabilized tetragonal structure is a prerequisite for achieving nickelate superconductivity at ambient pressure is under hot debate. Here, by post-annealing in high oxygen pressure environment, tetragonal La<sub>3</sub>Ni<sub>2</sub>O<sub>6.92</sub> single crystals are successfully obtained at ambient pressure, which exhibits a metallic behavior without a SDW transition. Moreover, superconductivity is also absent at high pressures up to ~ 70 GPa. Furthermore, by utilizing Helium as the pressure medium, we found that the superconductivity in pressurized orthorhombic La<sub>3</sub>Ni<sub>2</sub>O<sub>6.85</sub> is achieved in orthorhombic structure rather than tetragonal structure claimed previously. All these findings demonstrate that tetragonal structure is not prerequisite for achieving superconductivity in La<sub>3</sub>Ni<sub>2</sub>O<sub>7-δ</sub>. Finally, our present work suggests a deep correlation between SDW order and superconductivity, which imposes stringent constraints on the underlying mechanism for pressure-induced superconductivity in nickelates.
Authors
- Zhenfang Xing (ORCID: https://orcid.org/0009-0006-6450-682X)
- Rongqi Wu
- Jianjun Ying (ORCID: https://orcid.org/0000-0002-0104-9098)
- Shaohua Yang (ORCID: https://orcid.org/0000-0002-1759-2175)
- Houpu Li (ORCID: https://orcid.org/0000-0001-9698-8911)
- Binghui Ge (ORCID: https://orcid.org/0000-0002-6470-6278)
- Qiaoshi Zeng (ORCID: https://orcid.org/0000-0001-5960-1378)
- Kaibao Fan
- Xianhui Chen (ORCID: https://orcid.org/0000-0001-6947-1407)
- Tao Wu (ORCID: https://orcid.org/0000-0001-9805-4434)
- Zhidan Zeng (ORCID: https://orcid.org/0000-0003-4283-2393)
- Yikang Li (ORCID: https://orcid.org/0000-0003-1074-2975)
- Yuzhu Wang
- Mengzhu Shi (ORCID: https://orcid.org/0000-0001-6682-7869)
- Di Peng (ORCID: https://orcid.org/0000-0002-4235-6385)
Institutions
- University of Science and Technology of China (CN)
- Anhui University (CN)
- Hefei University of Technology (CN)
- Chinese Academy of Sciences (CN)
- Hefei National Center for Physical Sciences at Nanoscale (CN)
- Shanghai Advanced Research Institute (CN)
- Collaborative Innovation Center of Advanced Microstructures (CN)
- Center for High Pressure Science and Technology Advanced Research (CN)
- Nanjing University (CN)
Publication Details
- Journal
- Nature Communications
- Published
- 2025-10-15
- DOI
- https://doi.org/10.1038/s41467-025-63701-x
- Citations
- 6
- Primary Topic
- Magnetic and transport properties of perovskites and related materials
- Type
- article
- Field-Weighted Citation Impact
- 2.56
Funders
- Salt Science Research Foundation
- National Natural Science Foundation of China
- Chinese Academy of Sciences
- Science and Technology Commission of Shanghai Municipality
- High Energy Photon Source