Phase diagram of pressure-induced high temperature superconductor La$_{3}$Ni$_{2}$O$_{7+δ}$
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| Main Authors: | , , , , , , , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866915111941177344 |
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| author | Ueki, Yuta Sakurai, Hiroya Nagata, Hibiki Yamane, Kazuki Matsumoto, Ryo Terashima, Kensei Hirose, Keisuke Ohta, Hiroto Kato, Masaki Takano, Yoshihiko |
| author_facet | Ueki, Yuta Sakurai, Hiroya Nagata, Hibiki Yamane, Kazuki Matsumoto, Ryo Terashima, Kensei Hirose, Keisuke Ohta, Hiroto Kato, Masaki Takano, Yoshihiko |
| contents | We successfully synthesized samples of La$_{3}$Ni$_{2}$O$_{7+δ}$ ($δ= -0.50$, $-0.16$, $0.00$, $+0.01$, and $+0.12$) and measured the resistance under extremely high pressures using a diamond anvil cell to establish the electronic phase diagram. A Mott insulating state appears at $δ= -0.50$, where all Ni ions are divalent. With increasing oxygen content, superconductivity appears at $δ= 0.00$ and higher, above approximately 25 GPa, passing through Anderson localization at $δ= -0.16$. The superconducting transition temperature $T_{\mathrm{c}}$ decreases with increasing pressures for both $δ= 0.00$ and $+0.12$, with the pressure dependence of $T_{\mathrm{c}}$ being much stronger in the latter than in the former. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2408_04970 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Phase diagram of pressure-induced high temperature superconductor La$_{3}$Ni$_{2}$O$_{7+δ}$ Ueki, Yuta Sakurai, Hiroya Nagata, Hibiki Yamane, Kazuki Matsumoto, Ryo Terashima, Kensei Hirose, Keisuke Ohta, Hiroto Kato, Masaki Takano, Yoshihiko Superconductivity We successfully synthesized samples of La$_{3}$Ni$_{2}$O$_{7+δ}$ ($δ= -0.50$, $-0.16$, $0.00$, $+0.01$, and $+0.12$) and measured the resistance under extremely high pressures using a diamond anvil cell to establish the electronic phase diagram. A Mott insulating state appears at $δ= -0.50$, where all Ni ions are divalent. With increasing oxygen content, superconductivity appears at $δ= 0.00$ and higher, above approximately 25 GPa, passing through Anderson localization at $δ= -0.16$. The superconducting transition temperature $T_{\mathrm{c}}$ decreases with increasing pressures for both $δ= 0.00$ and $+0.12$, with the pressure dependence of $T_{\mathrm{c}}$ being much stronger in the latter than in the former. |
| title | Phase diagram of pressure-induced high temperature superconductor La$_{3}$Ni$_{2}$O$_{7+δ}$ |
| topic | Superconductivity |
| url | https://arxiv.org/abs/2408.04970 |