Superconductivity above 30 K due to the introduction of oxygen in CaFeAsF
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arXiv
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| Autores principales: | , , , , , , , , , , |
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| Formato: | Preprint |
| Publicado: |
2023
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| Materias: | |
| Acceso en línea: | |
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| _version_ | 1866913662863671296 |
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| author | Liu, Yixin Wang, Teng Xu, Zulei Jiang, Da Zhao, Yi Qi, Yanpeng Wang, Xiaoni Yang, Ming Ye, Mao Peng, Wei Mu, Gang |
| author_facet | Liu, Yixin Wang, Teng Xu, Zulei Jiang, Da Zhao, Yi Qi, Yanpeng Wang, Xiaoni Yang, Ming Ye, Mao Peng, Wei Mu, Gang |
| contents | Exploring new unconventional superconductors is of great value for both fundamental research and practical applications. It is a long-term challenge to develop and study more hole-doped superconductors in 1111 system of iron-based superconductors. Here we report the discovery of superconductivity with a critical transition temperature up to 30.7 K in the compound CaFeAsF by a post-annealing treatment in air atmosphere. The superconducting behaviors are verified in both the single-crystalline and polycrystalline samples by the resistance and magnetization measurements. The analysis by combining the depth-resolved time-of-flight secondary ion mass spectrometry (TOF-SIMS) and X-ray photoelectron spectroscopy (XPS) measurements shows that the introduction of oxygen elements and the consequent changing in Fe valence by the annealing treatment may lead to the hole-type doping, which is the origin for the occurrence of superconductivity. Our results pave the way for further in-depth investigations on the hole-doped 1111 system in iron-based superconductors. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2311_07943 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Superconductivity above 30 K due to the introduction of oxygen in CaFeAsF Liu, Yixin Wang, Teng Xu, Zulei Jiang, Da Zhao, Yi Qi, Yanpeng Wang, Xiaoni Yang, Ming Ye, Mao Peng, Wei Mu, Gang Superconductivity Materials Science Strongly Correlated Electrons Exploring new unconventional superconductors is of great value for both fundamental research and practical applications. It is a long-term challenge to develop and study more hole-doped superconductors in 1111 system of iron-based superconductors. Here we report the discovery of superconductivity with a critical transition temperature up to 30.7 K in the compound CaFeAsF by a post-annealing treatment in air atmosphere. The superconducting behaviors are verified in both the single-crystalline and polycrystalline samples by the resistance and magnetization measurements. The analysis by combining the depth-resolved time-of-flight secondary ion mass spectrometry (TOF-SIMS) and X-ray photoelectron spectroscopy (XPS) measurements shows that the introduction of oxygen elements and the consequent changing in Fe valence by the annealing treatment may lead to the hole-type doping, which is the origin for the occurrence of superconductivity. Our results pave the way for further in-depth investigations on the hole-doped 1111 system in iron-based superconductors. |
| title | Superconductivity above 30 K due to the introduction of oxygen in CaFeAsF |
| topic | Superconductivity Materials Science Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2311.07943 |