Differentiation of electron doping and oxygen reduction in electron-doped cuprates
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arXiv
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| Main Authors: | , , , , , , , |
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| Format: | Preprint |
| Published: |
2026
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| _version_ | 1866914513839718400 |
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| author | Miyamoto, M. Horio, M. Moriya, K. Takahashi, A. Tanaka, K. Koike, Y. Adachi, T. Matsuda, I. |
| author_facet | Miyamoto, M. Horio, M. Moriya, K. Takahashi, A. Tanaka, K. Koike, Y. Adachi, T. Matsuda, I. |
| contents | Electron-doped cuprates require not only electron doping by chemical substitution but also post-growth reduction annealing for realizing superconductivity. However, electron concentration can also be varied by reduction annealing, making it challenging to disentangle the respective influences of electron concentration and oxygen non-stoichiometry. Here, by combining alkali-metal dosing and angle-resolved photoemission spectroscopy, we monitored changes in the electronic structure of an electron-doped cuprate while supplying additional electrons to its surface without modifying oxygen content. Whereas a Fermi surface reconstruction due to long-range antiferromagnetic order was suppressed by alkali-metal deposition, the pseudogap -- which is associated with short-range spin/charge correlations and can be suppressed by efficient reduction annealing -- was found to persist. The results highlight significant contribution of impurity oxygen atoms to pseudogap formation in electron-doped cuprates. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2604_25450 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Differentiation of electron doping and oxygen reduction in electron-doped cuprates Miyamoto, M. Horio, M. Moriya, K. Takahashi, A. Tanaka, K. Koike, Y. Adachi, T. Matsuda, I. Superconductivity Strongly Correlated Electrons Electron-doped cuprates require not only electron doping by chemical substitution but also post-growth reduction annealing for realizing superconductivity. However, electron concentration can also be varied by reduction annealing, making it challenging to disentangle the respective influences of electron concentration and oxygen non-stoichiometry. Here, by combining alkali-metal dosing and angle-resolved photoemission spectroscopy, we monitored changes in the electronic structure of an electron-doped cuprate while supplying additional electrons to its surface without modifying oxygen content. Whereas a Fermi surface reconstruction due to long-range antiferromagnetic order was suppressed by alkali-metal deposition, the pseudogap -- which is associated with short-range spin/charge correlations and can be suppressed by efficient reduction annealing -- was found to persist. The results highlight significant contribution of impurity oxygen atoms to pseudogap formation in electron-doped cuprates. |
| title | Differentiation of electron doping and oxygen reduction in electron-doped cuprates |
| topic | Superconductivity Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2604.25450 |