An inhomogeneous magnetic exchange field at a superconductor/ferromagnet interface converts spin-singlet Cooper pairs to a spin-polarized triplet state. Although the decay envelope of triplet pairs within ferromagnetic materials is well studied, little is known about their decay in nonmagnetic metals and superconductors and, in particular, in the presence of spin-orbit coupling (SOC). Here, we investigate devices in which singlet and triplet supercurrents propagate into the s-wave superconductor Nb. In the normal state of Nb, triplet supercurrents decay over a distance of 5 nm, which is an order of magnitude smaller than the decay of spin-singlet pairs due to the SOC. In the superconducting state of Nb, triplet supercurrents are not able to couple with the singlet wave function and are thus blocked by the absence of available equilibrium states in the singlet gap. The results offer insight into the dynamics between s-wave singlet and s-wave triplet states.

超导体/铁磁体界面处的不均匀磁交换场将自旋单重态库珀对转换为自旋极化三重态。尽管铁磁材料中三重态对的衰变包络线已得到充分研究，但人们对它们在非磁性金属和超导体中的衰变知之甚少，特别是在存在自旋轨道耦合（SOC）的情况下。在这里，我们研究了单线态和三线态超电流传播到 s 波超导体 Nb 的装置。在 Nb 的正常状态下，三线态超电流在 5 nm 的距离内衰减，这比 SOC 导致的自旋单线对衰减小一个数量级。在铌的超导状态下，三重态超电流无法与单重态波函数耦合，因此由于单重态间隙中缺乏可用的平衡态而被阻止。结果提供了对 s 波单重态和 s 波三重态之间动力学的深入了解。