论文标题
磁性绝缘体候选MNSB4TE7中压力诱导的超导性和结构相变
Pressure-Induced Superconductivity and Structural Phase Transitions in Magnetic Topological Insulator Candidate MnSb4Te7
论文作者
论文摘要
磁性范德华晶体（MNX2TE4）M（X2TE3）N（X = SB，BI）由于其丰富的拓扑特性和外部磁场的持久性而引起了极大的关注。在这项工作中，我们报告了通过施加高压在磁性拓扑绝缘子候选者MNSB4TE7（M = 1，n = 1）中发现超导性的。抗铁磁有序对压力稳健，直到8 GPA，然后完全抑制。载体类型从孔型转换为电子型，并在15 GPA约为15 GPA的结构相变。超导率在临界压力30 GPA附近出现，其中MNSB4TE7转化为简单的立方相。有趣的是，MNSB4TE7显示了一个类似圆顶的相图，最大TC在50.7 GPA时为2.2 K。结果表明，具有电子状态的非平凡拓扑的MNSB4TE7在压缩后显示出新的基础状态。
The magnetic van der Waals crystals (MnX2Te4)m(X2Te3)n (X = Sb, Bi) have drawn significant attention due to their rich topological properties and the tenability by external magnetic field. In this work, we report on the discovery of superconductivity in magnetic topological insulator candidate MnSb4Te7 (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-type accompanied with structural phase transition at around 15 GPa. Superconductivity emerges near the critical pressure 30 GPa where MnSb4Te7 converted into a simple cubic phase. Interestingly, MnSb4Te7 shows a dome-like phase diagram with a maximum Tc of 2.2 K at 50.7 GPa. The results demonstrate that MnSb4Te7 with nontrivial topology of electronic states display new ground states upon compression.
