Superconducting Dome in $\mathrm{La}_{3-x}\mathrm{Sr}_{x}\mathrm{Ni}_{2}\mathrm{O}_{7-δ}$ Thin Films
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arXiv
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| Auteurs principaux: | , , , , , , , |
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| Format: | Preprint |
| Publié: |
2025
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| _version_ | 1866915787711709184 |
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| author | Wang, Maosen Hao, Bo Sun, Wenjie Yan, Shengjun Sun, Shengwang Zhang, Hongyi Gu, Zhengbin Nie, Yuefeng |
| author_facet | Wang, Maosen Hao, Bo Sun, Wenjie Yan, Shengjun Sun, Shengwang Zhang, Hongyi Gu, Zhengbin Nie, Yuefeng |
| contents | The ambient-pressure superconductivity in $\mathrm{La}_{3}\mathrm{Ni}_{2}\mathrm{O}_{7}$ thin films via compressive epitaxial strain provides a highly accessible platform for diverse characterization techniques, facilitating the studies of high-temperature superconductivity. Here, we systematically map the phase diagram and reveal the superconducting dome with an electron-hole crossover in compressively strained $\mathrm{La}_{3-x}\mathrm{Sr}_{x}\mathrm{Ni}_{2}\mathrm{O}_{7-δ}$ thin films by simultaneously tuning Sr doping and oxygen content. The maximum transition temperature (${T}_{c}$) coincides with an anomalous sign change in the Hall coefficient (${R}_{H}$), reminiscent of electron-doped cuprates, which may signal a Fermi surface reconstruction. Beyond the superconducting dome, a $\ln1/T$ insulating regime and a $T$-linear resistivity regime are also resolved, resembling behaviors observed in cuprates and infinite-layer nickelates. This work reveals a dome-shaped relationship between ${T}_{c}$ and ${R}_{H}$ and establishes a key framework for understanding unconventional superconductivity in nickelate systems. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2508_15284 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Superconducting Dome in $\mathrm{La}_{3-x}\mathrm{Sr}_{x}\mathrm{Ni}_{2}\mathrm{O}_{7-δ}$ Thin Films Wang, Maosen Hao, Bo Sun, Wenjie Yan, Shengjun Sun, Shengwang Zhang, Hongyi Gu, Zhengbin Nie, Yuefeng Superconductivity Materials Science Strongly Correlated Electrons The ambient-pressure superconductivity in $\mathrm{La}_{3}\mathrm{Ni}_{2}\mathrm{O}_{7}$ thin films via compressive epitaxial strain provides a highly accessible platform for diverse characterization techniques, facilitating the studies of high-temperature superconductivity. Here, we systematically map the phase diagram and reveal the superconducting dome with an electron-hole crossover in compressively strained $\mathrm{La}_{3-x}\mathrm{Sr}_{x}\mathrm{Ni}_{2}\mathrm{O}_{7-δ}$ thin films by simultaneously tuning Sr doping and oxygen content. The maximum transition temperature (${T}_{c}$) coincides with an anomalous sign change in the Hall coefficient (${R}_{H}$), reminiscent of electron-doped cuprates, which may signal a Fermi surface reconstruction. Beyond the superconducting dome, a $\ln1/T$ insulating regime and a $T$-linear resistivity regime are also resolved, resembling behaviors observed in cuprates and infinite-layer nickelates. This work reveals a dome-shaped relationship between ${T}_{c}$ and ${R}_{H}$ and establishes a key framework for understanding unconventional superconductivity in nickelate systems. |
| title | Superconducting Dome in $\mathrm{La}_{3-x}\mathrm{Sr}_{x}\mathrm{Ni}_{2}\mathrm{O}_{7-δ}$ Thin Films |
| topic | Superconductivity Materials Science Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2508.15284 |