Unlike conventional spin-singlet Cooper pairs, spin-triplet pairs can carry spin^1,2. Triplet supercurrents were discovered in Josephson junctions with metallic ferromagnet spacers, where spin transport can occur only within the ferromagnet and in conjunction with a charge current. Ferromagnetic resonance injects a pure spin current from a precessing ferromagnet into adjacent non-magnetic materials^3,4. For spin-singlet pairing, the ferromagnetic resonance spin pumping efficiency decreases below the critical temperature (T_c) of a coupled superconductor^5,6. Here we present ferromagnetic resonance experiments in which spin sink layers with strong spin–orbit coupling are added to the superconductor. Our results show that the induced spin currents, rather than being suppressed, are substantially larger in the superconducting state compared with the normal state; although further work is required to establish the details of the spin transport process, we show that this cannot be mediated by quasiparticles and is most likely a triplet pure spin supercurrent.

与传统的自旋-单重库珀对不同，自旋-三重对可以携带^1，2。在带有金属铁磁体隔片的约瑟夫森结中发现了三重态超电流，其中自旋输运只能在铁磁体内并与充电电流一起发生。铁磁共振将进动铁磁体的纯自旋电流注入相邻的非磁性材料^3,4中。对于自旋-单配对，铁磁共振自旋泵浦效率降低到耦合超导体^5,6的临界温度（T _c）以下。在这里，我们介绍了铁磁共振实验，其中将具有强自旋-轨道耦合的自旋吸收层添加到超导体中。我们的结果表明，与正常状态相比，在超导状态下感应的自旋电流而不是被抑制的要大得多。尽管需要进一步的工作来确定自旋输运过程的细节，但我们表明这不能由准粒子介导，并且很可能是三重态纯自旋超电流。