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| Main Authors: | , , , , , , , , , |
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| Format: | Preprint |
| Published: |
2024
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2407.06061 |
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| _version_ | 1866913690038566912 |
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| author | Xiang, Zhe-Ning Zhang, Ying-Jie Lu, Qing Li, Qing Li, Yiwen Huang, Tianheng Zhu, Yijie Ye, Yongze Sun, Jian Wen, Hai-Hu |
| author_facet | Xiang, Zhe-Ning Zhang, Ying-Jie Lu, Qing Li, Qing Li, Yiwen Huang, Tianheng Zhu, Yijie Ye, Yongze Sun, Jian Wen, Hai-Hu |
| contents | The discovery of superconductivity in 3$d$-transition metal compounds with strong magnetism is interesting but rare. Especially for Mn-based compounds, there exist only very limited materials that show superconductivity. Here, we report the discovery of superconductivity up to 14.2 K in a Mn-based material MnB$_4$. By applying high pressures, we found the continuous suppression of a weak insulating behavior and the occurrence of superconductivity after about 30 GPa. With further increasing pressure, $T_\text{c}$ is gradually enhanced and reaches the maximum value of about 14.2 K at 150 GPa with a Fermi-Liquid behavior in the normal states. The synchrotron X-ray diffraction data reveal the unchanged monoclinic (S.G: $P2_1/c$) symmetry but an unusual crossover of the lattice parameters $b$ and $c$. Theoretical calculations based on the electron-phonon coupling picture reveal a very low $T_\text{c}$ (less than 1 K), manifesting an exotic pairing mechanism beyond the Bardeen-Cooper-Schrieffer (BCS) theory. Our findings show a promising way to explore high $T_\text{c}$ superconductivity by combining the 3d-transition metal magnetic elements and light elements. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2407_06061 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Superconductivity up to 14.2 K in MnB$_4$ under pressure Xiang, Zhe-Ning Zhang, Ying-Jie Lu, Qing Li, Qing Li, Yiwen Huang, Tianheng Zhu, Yijie Ye, Yongze Sun, Jian Wen, Hai-Hu Superconductivity Materials Science The discovery of superconductivity in 3$d$-transition metal compounds with strong magnetism is interesting but rare. Especially for Mn-based compounds, there exist only very limited materials that show superconductivity. Here, we report the discovery of superconductivity up to 14.2 K in a Mn-based material MnB$_4$. By applying high pressures, we found the continuous suppression of a weak insulating behavior and the occurrence of superconductivity after about 30 GPa. With further increasing pressure, $T_\text{c}$ is gradually enhanced and reaches the maximum value of about 14.2 K at 150 GPa with a Fermi-Liquid behavior in the normal states. The synchrotron X-ray diffraction data reveal the unchanged monoclinic (S.G: $P2_1/c$) symmetry but an unusual crossover of the lattice parameters $b$ and $c$. Theoretical calculations based on the electron-phonon coupling picture reveal a very low $T_\text{c}$ (less than 1 K), manifesting an exotic pairing mechanism beyond the Bardeen-Cooper-Schrieffer (BCS) theory. Our findings show a promising way to explore high $T_\text{c}$ superconductivity by combining the 3d-transition metal magnetic elements and light elements. |
| title | Superconductivity up to 14.2 K in MnB$_4$ under pressure |
| topic | Superconductivity Materials Science |
| url | https://arxiv.org/abs/2407.06061 |