The discovery of superconducting states in diverse topological materials generates a burgeoning interest to explore a topological superconductor and to realize a fault-tolerant topological quantum computation. A variety of routes to realize topological superconductors are proposed, and many types of topological materials are developed. However, a pristine topological material with a natural superconducting state is relatively rare as compared to topological materials with artificially induced superconductivity. Here, it is reported that the planar honeycomb structured 3D topological Dirac semimetal (TDS) SrCuBi, which is the Zintl phase, shows a natural surface superconductivity at 2.1 K under ambient pressure. It is clearly identified from theoretical calculations that a topologically nontrivial state exists on the (100) surface. Further, its superconducting transition temperature (T_c) increases by applying pressure, exhibiting a maximal T_c of 4.8 K under 6.2 GPa. It is believed that this discovery opens up a new possibility of exploring exotic Majorana fermions at the surface of 3D TDS superconductors.

中文翻译：

---

拓扑狄拉克半金属 SrCuBi 中的压力相关超导性


不同拓扑材料中超导态的发现引起了人们对探索拓扑超导体和实现容错拓扑量子计算的兴趣。提出了多种实现拓扑超导体的路线，并开发了多种类型的拓扑材料。然而，与人工诱导超导的拓扑材料相比，具有自然超导态的原始拓扑材料相对较少。据报道，平面蜂窝结构的 3D 拓扑狄拉克半金属 (TDS) SrCuBi（即 Zintl 相）在环境压力下在 2.1 K 下表现出自然表面超导性。从理论计算中可以清楚地看出，（100）表面上存在拓扑非平凡状态。此外，其超导转变温度（T _c ）通过施加压力而升高，在6.2GPa下表现出最大4.8K的T _c 。人们相信，这一发现为探索3D TDS超导体表面的奇异马约拉纳费米子开辟了新的可能性。