Report
Superconductivity in Scandium Borocarbide with orbital hybridization
| العنوان: | Superconductivity in Scandium Borocarbide with orbital hybridization |
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| المؤلفون: | Wu, W., Li, Y. J., Zhang, J. H., Yu, Z. H., Liu, Z. Y., Zheng, P., Yang, H. X., Dong, C., Liu, K., Xiang, T., Luo, J. L. |
| المصدر: | Mater. Res. Express 7 (2020) 116001 |
| سنة النشر: | 2021 |
| المجموعة: | Condensed Matter |
| مصطلحات موضوعية: | Condensed Matter - Superconductivity |
| الوصف: | Exploration of superconductivity in light element compounds has drawn considerable attention because those materials can easily realize the high $T_{c}$ superconductivity, such as ${\mathrm{LnNi}}_{2}{\mathrm{B}_{2}}{\mathrm{C}}$ ($T_{c}$ =17 K), ${\mathrm{Mg}}{\mathrm{B}}_{2}$ ($T_{c}$ =39 K), and very recently super-hydrides under pressure ($T_{c}$ =250 K). Here we report the discovery of bulk superconductivity at 7.8 K in scandium borocarbide ${\mathrm{Sc}}_{20}{\mathrm{B}}{\mathrm{C}}_{27}$ with a tetragonal lattice which structure changes based on the compound of ${\mathrm{Sc}}_{3}{\mathrm{C}}_{4}$ with very little B doping. Magnetization and specific heat measurements show bulk superconductivity. An upper critical field of Hc2(0) ~ 8 T is determined. Low temperature specific-heat shows that this system is a BCS fully gapped s-wave superconductor. Electronic structure calculations demonstrate that compared with ${\mathrm{Sc}}_{3}{\mathrm{C}}_{4}$ there are more orbital overlap and hybridization between Sc 3d electrons and 2p electrons of C-C(B)-C fragment in ${\mathrm{Sc}}_{20}{\mathrm{B}}{\mathrm{C}}_{27}$, which form a new electric conduction path of Sc-C(B)-Sc. Those changes influence the band structure at the Fermi level and may be the reason of superconductivity in ${\mathrm{Sc}}_{20}{\mathrm{B}}{\mathrm{C}}_{27}$. Comment: 13 pages, 6 figures |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1088/2053-1591/abc4b3 |
| URL الوصول: | http://arxiv.org/abs/2101.02432 |
| رقم الانضمام: | edsarx.2101.02432 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1088/2053-1591/abc4b3 |
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