We report epitaxial growth and superconducting properties of superconductor/ferromagnet (S/F) multilayers consisting of an s-wave superconducting bismuthate BaPb_0.75Bi_0.25O₃ (BPBO) and a ferromagnetic insulating manganite La_0.875Sr_0.125MnO₃ (LSMO). We demonstrate that the superconductivity of BPBO sandwiched by LSMO is preserved down to a thickness close to the superconducting coherence length. The superconducting transition temperature of BPBO is unaffected by the magnetization alignment of the LSMO layers, which is in sharp contrast to YBa₂Cu₃O₇ showing a clear magnetic exchange interaction. While the stable s-wave superconductivity in the S/F oxide multilayer demonstrated in this work is promising for the development of quantum spin devices with strong spin–orbit coupling, the absence of the magnetic exchange field effect highlights the importance of interface engineering for the realization of a strongly exchange-coupled s-wave S/F oxide interface.

中文翻译：

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铋酸盐/锰酸盐外延多层膜的超导性能

我们报告了超导体/铁磁体（S/F）多层的外延生长和超导特性，该多层由s波超导铋酸盐BaPb _0.75 Bi _0.25 O ₃ (BPBO)和铁磁绝缘锰酸盐La _0.875 Sr _0.125 MnO ₃ (LSMO)。我们证明，被 LSMO 夹在中间的 BPBO 的超导性在接近超导相干长度的厚度下得以保留。BPBO的超导转变温度不受LSMO层磁化排列的影响，这与YBa ₂ Cu ₃ O ₇表现出明显的磁交换相互作用形成鲜明对比。稳定的同时s这项工作中展示的 S/F 氧化物多层中的波超导性对于开发具有强自旋轨道耦合的量子自旋器件来说是有希望的，磁交换场效应的缺失凸显了界面工程对于实现强自旋轨道耦合的重要性。交换耦合s-波S/F氧化物界面。