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Observation of robust edge superconductivity in Fe(Se,Te) under strong magnetic perturbation

Science Bulletin 2021年第5期66卷 425-432,M0003页

作者： Da Jiang Yinping Pan Shiyuan Wang Yishi Lin Connor M.Holland John R.Kirtley Xianhui Chen Jun Zhao Lei Chen Shaoyu Yin Yihua Wang Shanghai Institute of Microsystem and Information Technology Shanghai 200050China State Key Laboratory of Surface Physics and Department of Physics Fudan UniversityShanghai 200433China Department of Physics Stanford UniversityStanfordCA 94305USA Department of Physics University of Science and Technology of ChinaHefei 230026China Institute for Theoretical Physics and Cosmology Zhejiang University of TechnologyHangzhou 310023China Shanghai Research Center for Quantum Sciences Shanghai 201315China

The iron-chalcogenide high temperature superconductor Fe(Se,Te)(FST) has been reported to exhibit complex magnetic ordering and nontrivial band topology which may lead to novel superconducting phenomena. However, the recent studies have so far been largely concentrated on its band and spin structures while its mesoscopic electronic and magnetic response, crucial for future device applications, has not been explored experimentally. Here, we used scanning superconducting quantum interference device microscopy for its sensitivity to both local diamagnetic susceptibility and current distribution in order to image the superfluid density and supercurrent in FST. We found that in FST with 10% interstitial Fe,whose magnetic structure was heavily disrupted, bulk superconductivity was significantly suppressed whereas edge still preserved strong superconducting diamagnetism. The edge dominantly carried supercurrent despite of a very long magnetic penetration depth. The temperature dependences of the superfluid density and supercurrent distribution were distinctively different between the edge and the *** Heisenberg modeling showed that magnetic dopants stabilize anti-ferromagnetic spin correlation along the edge, which may contribute towards its robust superconductivity. Our observations hold implication for FST as potential platforms for topological quantum computation and superconducting spintronics.

关键词： Edge superconductivity Magnetic perturbation Anti-ferromagnetic spin correlation iron-chalcogenide superconductors Scanning SQUID microscopy

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