Magnetic materials interfaced with superconductors may reveal new physical phenomena with potential for quantum technologies. The use of molecules as magnetic components has already shown great promise, but the diversity of properties offered by the molecular realm remains largely unexplored. Here we investigate a submonolayer of tetrairon(iii) propeller-shaped single molecule magnets deposited on a superconducting lead surface. This material combination reveals a strong influence of the superconductor on the spin dynamics of the single molecule magnet. It is shown that the superconducting transition to the condensate state switches the single molecule magnet from a blocked magnetization state to a resonant quantum tunnelling regime. Our results open perspectives to control single molecule magnetism via superconductors and to use single molecule magnets as local probes of the superconducting state.

与超导体连接的磁性材料可能会揭示具有量子技术潜力的新物理现象。分子作为磁性元件的使用已经显示出巨大的希望，但分子领域提供的多样性特性在很大程度上仍未得到探索。在这里，我们研究了四铁的亚单层（iii) 螺旋桨形单分子磁体沉积在超导铅表面上。这种材料组合揭示了超导体对单分子磁体的自旋动力学的强烈影响。结果表明，向凝聚态的超导转变将单分子磁体从受阻磁化状态切换到共振量子隧穿状态。我们的结果为通过超导体控制单分子磁性和使用单分子磁体作为超导状态的局部探针开辟了前景。