تقرير
Superconductivity up to 14.2 K in MnB$_4$ under pressure
| العنوان: | Superconductivity up to 14.2 K in MnB$_4$ under pressure |
|---|---|
| المؤلفون: | Xiang, Zhe-Ning, Zhang, Ying-Jie, Lu, Qing, Li, Qing, Li, Yiwen, Huang, Tianheng, Zhu, Yijie, Ye, Yongze, Sun, Jian, Wen, Hai-Hu |
| سنة النشر: | 2024 |
| المجموعة: | Condensed Matter |
| مصطلحات موضوعية: | Condensed Matter - Superconductivity, Condensed Matter - Materials Science |
| الوصف: | 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. Comment: 36 pages total; 24 pages of main text with 5 figures, 12 pages of supplement with 1 table and 8 figures |
| نوع الوثيقة: | Working Paper |
| URL الوصول: | http://arxiv.org/abs/2407.06061 |
| رقم الأكسشن: | edsarx.2407.06061 |
| قاعدة البيانات: | arXiv |
| الوصف غير متاح. |