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| Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
| Published: |
2025
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2509.12606 |
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| _version_ | 1866915496086994944 |
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| author | Cao, Zi-Yu Peng, Di Choi, Seokmin Lan, Fujun Yu, Lan Zhang, Enkang Xing, Zhenfang Liu, Yuxin Zhang, Feiyang Luo, Tao Chen, Lixing Hong, Vuong Thi Anh Paek, Seung-Yeop Jang, Harim Xie, Jinghong Liu, Huayu Lou, Hongbo Zeng, Zhidan Ding, Yang Zhao, Jun Liu, Cailong Park, Tuson Zeng, Qiaoshi Mao, Ho-kwang |
| author_facet | Cao, Zi-Yu Peng, Di Choi, Seokmin Lan, Fujun Yu, Lan Zhang, Enkang Xing, Zhenfang Liu, Yuxin Zhang, Feiyang Luo, Tao Chen, Lixing Hong, Vuong Thi Anh Paek, Seung-Yeop Jang, Harim Xie, Jinghong Liu, Huayu Lou, Hongbo Zeng, Zhidan Ding, Yang Zhao, Jun Liu, Cailong Park, Tuson Zeng, Qiaoshi Mao, Ho-kwang |
| contents | The recent discovery of superconductivity in pressure-stabilized bulk La3Ni2O7-delta, with a critical temperature (Tc) exceeding 77 K, has opened a new frontier in high-temperature superconductivity research beyond cuprates. Yet, the superconducting gap amplitude and symmetry, the key parameters to characterize a superconductor, remain elusive due to the overwhelming challenges of gap studies under high pressure. Here, we introduce in situ directional point-contact spectroscopy conducted under truly hydrostatic pressure, enabling the direct mapping of the superconducting gap in pressurized La3Ni2O7-delta single crystals. Depending on the junction orientation, differential conductance (dI/dV) spectra exhibit distinct V-shaped quasiparticle features and a sharp zero-bias peak, indicating a predominant d-wave-like pairing symmetry. Measurement of the c-axis gap amplitude Delta yields a gap-to-Tc ratio of 2Delta/kBTc = 4.2(5), positioning La3Ni2O7-delta firmly among unconventional, nodal high-Tc superconductors. These findings set stringent constraints on theoretical models for nickelate superconductors and establish a robust spectroscopic approach for understanding superconductors under extreme pressures. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2509_12606 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Direct Observation of d-Wave Superconducting Gap Symmetry in Pressurized La3Ni2O7-delta Single Crystals Cao, Zi-Yu Peng, Di Choi, Seokmin Lan, Fujun Yu, Lan Zhang, Enkang Xing, Zhenfang Liu, Yuxin Zhang, Feiyang Luo, Tao Chen, Lixing Hong, Vuong Thi Anh Paek, Seung-Yeop Jang, Harim Xie, Jinghong Liu, Huayu Lou, Hongbo Zeng, Zhidan Ding, Yang Zhao, Jun Liu, Cailong Park, Tuson Zeng, Qiaoshi Mao, Ho-kwang Superconductivity The recent discovery of superconductivity in pressure-stabilized bulk La3Ni2O7-delta, with a critical temperature (Tc) exceeding 77 K, has opened a new frontier in high-temperature superconductivity research beyond cuprates. Yet, the superconducting gap amplitude and symmetry, the key parameters to characterize a superconductor, remain elusive due to the overwhelming challenges of gap studies under high pressure. Here, we introduce in situ directional point-contact spectroscopy conducted under truly hydrostatic pressure, enabling the direct mapping of the superconducting gap in pressurized La3Ni2O7-delta single crystals. Depending on the junction orientation, differential conductance (dI/dV) spectra exhibit distinct V-shaped quasiparticle features and a sharp zero-bias peak, indicating a predominant d-wave-like pairing symmetry. Measurement of the c-axis gap amplitude Delta yields a gap-to-Tc ratio of 2Delta/kBTc = 4.2(5), positioning La3Ni2O7-delta firmly among unconventional, nodal high-Tc superconductors. These findings set stringent constraints on theoretical models for nickelate superconductors and establish a robust spectroscopic approach for understanding superconductors under extreme pressures. |
| title | Direct Observation of d-Wave Superconducting Gap Symmetry in Pressurized La3Ni2O7-delta Single Crystals |
| topic | Superconductivity |
| url | https://arxiv.org/abs/2509.12606 |