标题： 压驱动的拓扑绝缘体 GeBi4Te7 超导性 显示英文标题

标题： Pressure-driven superconductivity in the topological insulator GeBi4Te7

摘要： 范德华力、伪二元硫属化物（ACh）m（Pn2Ch3）n（A = Ge，Mn， Pb等。 ；Pn = Sb或Bi；Ch = Te，Se）最近被报道可以容纳大量拓扑物质相，包括量子反常霍尔态和具有量化电磁效应的拓扑轴子态。 这个系列中的一个亚组，如MnSb4Te7和GeSb4Te7，可以通过施加物理压力进入超导态，使它们成为实现所谓拓扑超导性的可行候选材料。 然而，磁涨落在这种压力诱导的超导性中的作用仍然不清楚。 在这里，我们报告了非磁性的GeBi4Te7在压力下诱导的多个超导相，伴随着高压拉曼散射所证明的相应结构转变。 与其他成员相比，我们发现非磁性亚组的超导转变温度显著高于其磁性同系物，这可能暗示磁涨落对超导性的形成有不利影响，至少在这个伪二元硫属化物家族中是如此。 显示英文摘要

摘要： The van der Waals, pseudo-binary chalcogenides (ACh)m(Pn2Ch3)n (A = Ge, Mn, Pb, etc.; Pn = Sb or Bi; Ch = Te, Se) have recently been reported to host a vast landscape of topological phases of matter, including the quantum anomalous Hall state and topological axion state with quantized magnetoelectric effect. A subgroup in this series, like MnSb4Te7 and GeSb4Te7, can be driven to a superconducting state by applying a physical pressure, making them viable candidates to realize so-called topological superconductivity. However, the role of magnetic fluctuations in this pressure-induced superconductivity remains unclear. Here, we report the pressure-induced multiple superconducting phases in the nonmagnetic GeBi4Te7, accompanied by corresponding structural transitions evidenced from the high-pressure Raman scattering. In comparison with other members in this family, we find the superconducting transition temperature of the nonmagnetic subgroup is significantly higher than their magnetic homologues, possibly hinting at the detrimental role played by the magnetic fluctuations in the superconductivity formation, at least in this pseudo-binary chalcogenide family.