A resilient superconductor Superconductivity typically does not fare well in the presence of magnetic fields, which tend to break the electron pairs that make a material superconducting. However, some materials, such as the recently discovered Ising superconductors, retain their properties in very high magnetic fields. Ising pairing was identified in transition metal dichalcogenides such as molybdenum disulfide and required the breaking of inversion symmetry. Falson et al. have now found a similar resilience to in-plane magnetic fields in another two-dimensional material, few-layer stanene. The band structure of stanene and the lack of inversion symmetry breaking in the system required a distinct theoretical model to explain this property, now dubbed type II Ising pairing. Science, this issue p. 1454 Transport measurements reveal a superconductor that is unusually resilient to in-plane magnetic fields. Spin-orbit coupling has proven indispensable in the realization of topological materials and, more recently, Ising pairing in two-dimensional superconductors. This pairing mechanism relies on inversion symmetry–breaking and sustains anomalously large in-plane polarizing magnetic fields whose upper limit is predicted to diverge at low temperatures. Here, we show that the recently discovered superconductor few-layer stanene, epitaxially strained gray tin (α-Sn), exhibits a distinct type of Ising pairing between carriers residing in bands with different orbital indices near the Γ-point. The bands are split as a result of spin-orbit locking without the participation of inversion symmetry–breaking. The in-plane upper critical field is strongly enhanced at ultralow temperature and reveals the predicted upturn.

中文翻译：

---

少层锡烯中的 II 型 Ising 配对

弹性超导体 超导在存在磁场的情况下通常表现不佳，磁场往往会破坏使材料超导的电子对。然而，一些材料，例如最近发现的 Ising 超导体，在非常高的磁场中仍保持其特性。Ising 配对在过渡金属二硫属元素化物（如二硫化钼）中得到鉴定，需要打破反转对称性。法尔森等人。现在已经在另一种二维材料少层锡烯中发现了对面内磁场的类似弹性。stanene 的能带结构和系统中缺乏反转对称性破坏需要一个独特的理论模型来解释这种特性，现在称为 II 型 Ising 配对。科学，这个问题 p。1454 传输测量揭示了一种对平面磁场具有异常弹性的超导体。自旋轨道耦合在拓扑材料的实现以及最近二维超导体中的 Ising 配对中已被证明是必不可少的。这种配对机制依赖于反转对称性破坏，并维持异常大的面内极化磁场，其上限预计在低温下发散。在这里，我们展示了最近发现的超导体少层锡烯，外延应变灰锡（α-Sn），在位于 Γ 点附近具有不同轨道指数的带中的载流子之间表现出独特类型的 Ising 配对。由于自旋轨道锁定而导致带分裂，而没有反转对称性破坏的参与。