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| Main Authors: | , , , , , , , |
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| Format: | Preprint |
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2025
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2506.15319 |
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| _version_ | 1866916799277170688 |
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| author | Osada, Motoki Terakura, Chieko Kikkawa, Akiko Nakajima, Masamichi Chen, Hsiao-Yi Nomura, Yusuke Tokura, Yoshinori Tsukazaki, Atsushi |
| author_facet | Osada, Motoki Terakura, Chieko Kikkawa, Akiko Nakajima, Masamichi Chen, Hsiao-Yi Nomura, Yusuke Tokura, Yoshinori Tsukazaki, Atsushi |
| contents | The recent discovery of high-transition temperature ($T_\mathrm{c}$) superconductivity in pressurized La$_{3}$Ni$_{2}$O$_{7}$ bulk crystals has attracted keen attention due to its characteristic energy diagram of $e_{g}$ orbitals, containing nearly half-filled $d_{3z^2 - r^2}$ and quarter-filled $d_{x^2 - y^2}$ orbitals. This finding provides valuable insights into the orbital contributions and interlayer interactions in double NiO$_{6}$ octahedra, offering opportunities to control the electronic structure via ligand field variations. Here, we demonstrate strain-tuning of $T_\mathrm{c}$ over a range of 50 K in La$_{3}$Ni$_{2}$O$_{7}$ films grown on different oxide substrates under 20 GPa. As the $c/a$ ratio increases, the onset $T_\mathrm{c}$ systematically rises from 10 K in the tensile-strained film on SrTiO$_{3}$ to a maximum of about 60 K in the compressively strained film on LaAlO$_{3}$. These systematic variations suggest that strain engineering is a promising strategy for expanding superconductivity in bilayer nickelates by tuning the orbital energy landscape toward high-$T_\mathrm{c}$ superconductivity. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2506_15319 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Strain-tuning for superconductivity in La$_3$Ni$_2$O$_7$ thin films Osada, Motoki Terakura, Chieko Kikkawa, Akiko Nakajima, Masamichi Chen, Hsiao-Yi Nomura, Yusuke Tokura, Yoshinori Tsukazaki, Atsushi Superconductivity Materials Science The recent discovery of high-transition temperature ($T_\mathrm{c}$) superconductivity in pressurized La$_{3}$Ni$_{2}$O$_{7}$ bulk crystals has attracted keen attention due to its characteristic energy diagram of $e_{g}$ orbitals, containing nearly half-filled $d_{3z^2 - r^2}$ and quarter-filled $d_{x^2 - y^2}$ orbitals. This finding provides valuable insights into the orbital contributions and interlayer interactions in double NiO$_{6}$ octahedra, offering opportunities to control the electronic structure via ligand field variations. Here, we demonstrate strain-tuning of $T_\mathrm{c}$ over a range of 50 K in La$_{3}$Ni$_{2}$O$_{7}$ films grown on different oxide substrates under 20 GPa. As the $c/a$ ratio increases, the onset $T_\mathrm{c}$ systematically rises from 10 K in the tensile-strained film on SrTiO$_{3}$ to a maximum of about 60 K in the compressively strained film on LaAlO$_{3}$. These systematic variations suggest that strain engineering is a promising strategy for expanding superconductivity in bilayer nickelates by tuning the orbital energy landscape toward high-$T_\mathrm{c}$ superconductivity. |
| title | Strain-tuning for superconductivity in La$_3$Ni$_2$O$_7$ thin films |
| topic | Superconductivity Materials Science |
| url | https://arxiv.org/abs/2506.15319 |