发表机构
Fudan University; ShanghaiTech University; Tsinghua University; Southern University of Science and Technology (SUSTech)（复旦大学; 上海科技大学; 清华大学; 南方科技大学）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
该研究通过应变调控反铁磁CrSb，在其基约瑟夫森结中实现了150 nm的长距离无耗散超电流，为超导自旋电子学应用提供了新方向。
AI 中文摘要
反铁磁材料具有净磁化强度为零、动量依赖自旋劈裂的特征，为实现无有害杂散场的非常规超导态提供了独特平台。本文中，我们展示了应变反铁磁体CrSb外延薄膜中的长距离约瑟夫森超电流输运，在CrSb基约瑟夫森结中观测到横向间隔距离达150 nm的无耗散超电流，该距离比常规自旋单态相干长度大近两个数量级。该超电流还伴随有清晰的磁场诱导量子干涉图样，为真实约瑟夫森耦合提供了直接证据。我们的结果表明，反铁磁体是产生无宏观磁杂散场的长距离超电流的有前景途径，为超导自旋电子学应用开辟了新机遇。
英文摘要
Altermagnetic materials, characterized by vanishing net magnetization and momentum-dependent spin splitting, provide a unique platform for realizing unconventional superconducting states without the detrimental stray fields. Here, we demonstrate long-distance Josephson supercurrent transport through epitaxial thin films of the strained altermagnet CrSb. We observe a dissipationless supercurrent across a lateral spacer distance of 150 nm in a CrSb-based Josephson junction, exceeding the conventional spin-singlet coherence length by nearly two orders of magnitude. This supercurrent is further accompanied by a well-defined magnetic-field-induced quantum interference pattern, providing direct evidence for genuine Josephson coupling. Our results reveal altermagnets as a promising route toward generating long-distance supercurrents without macroscopic magnetic stray fields, opening new opportunities for superconducting spintronic applications.
