The intimate connection between magnetism and superconducting pairing plays a central role in determining the occurrence of unconventional superconducting states. In particular, magnetism can cause a modulation of superconducting pairing in real space in both copper-based and iron-based materials. Exploring this effect can shed light on the mechanism of unconventional superconductivity. Here we report on the discovery of a spatially varying superconducting state residing at the interface between KTaO₃ and ferromagnetic EuO. Electrical transport measurements reveal different values of the critical temperature and magnetic field at which the superconductivity breaks down when current is applied along the two orthogonal in-plane directions. This anisotropy occurs in low-carrier-density samples that are characterized by strong coupling between the Ta 5d and Eu 4f electrons, whereas in high-carrier-density samples, the coupling is weakened and the superconducting properties become isotropic. Our observations imply the emergence of superconducting stripes where phase coherence is established ahead of the rest of the interface, arising from a band-filling-dependent ferromagnetic proximity.

磁性和超导配对之间的密切联系在决定非常规超导态的发生方面发挥着核心作用。特别是，磁性可以在铜基和铁基材料中引起真实空间中超导配对的调制。探索这种效应可以揭示非常规超导的机制。_{在这里，我们报告了在 KTaO 3}和铁磁 EuO之间的界面处发现了空间变化的超导态。电输运测量揭示了当沿两个正交面内方向施加电流时超导性被破坏的临界温度和磁场的不同值。这种各向异性发生在低载流子密度样品中，其特征是Ta 5 d和Eu 4 f电子之间的强耦合，而在高载流子密度样品中，耦合减弱，超导特性变得各向同性。我们的观察表明超导带的出现，其中相位相干性在界面的其余部分之前建立，这是由带填充相关的铁磁邻近性引起的。