Pressure-induced superconductivity in magnetic topological insulator candidate MnSb 4 Te 7

作者：Cuiying Pei, Ming Xi, Qi Wang, Wujun Shi, Juefei Wu, Lingling Gao, Yi Zhao, Shangjie Tian, Weizheng Cao, Changhua Li, Mingxin Zhang, Shihao Zhu, Yulin Chen, Hechang Lei, Yanpeng Qi · 发表于：Physical Review Materials · 年份：2022 · DOI：10.1103/physrevmaterials.6.l101801 · 被引用次数：23 · 研究领域：Topological Materials and Phenomena、2D Materials and Applications、Advanced Condensed Matter Physics

The magnetic van der Waals crystals ${(\mathrm{Mn}\phantom{\rule{0.16em}{0ex}}{X}_{2}{\mathrm{Te}}_{4})}_{m}{({X}_{2}{\mathrm{Te}}_{3})}_{n}$ $(X=\mathrm{Sb},\phantom{\rule{0.28em}{0ex}}\mathrm{Bi})$ have drawn significant attention due to their rich topological properties and tenability by external magnetic field. In this letter, we report on the discovery of superconductivity in magnetic topological insulator candidate ${\mathrm{MnSb}}_{4}{\mathrm{Te}}_{7}$ ($m=1$, $n=1$) via the application of high pressure. The antiferromagnetic ordering is robust to pressure until 8 GPa and then fully suppressed. The carrier type converts from hole to electron accompanied with structural phase transition at $\ensuremath{\sim}16\phantom{\rule{0.28em}{0ex}}\mathrm{GPa}$. Superconductivity emerges near the critical pressure 30 GPa where ${\mathrm{MnSb}}_{4}{\mathrm{Te}}_{7}$ converts to phase III. Interestingly, ${\mathrm{MnSb}}_{4}{\mathrm{Te}}_{7}$ shows a domelike phase diagram with a maximum ${T}_{\mathrm{c}}$ of 2.2 K at 50.7 GPa.