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Exploring the impact of core expansion on the vortex distribution in superconducting-normal-metal hybrid nanostructures

机译：探索核扩展对超导-常态金属杂化纳米结构中涡流分布的影响

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摘要

The superconducting condensate in a bilayer normal-metal-superconducting film has a nonuniform dependence throughout the layer. For sufficiently thin normal metallic films, the superconducting correlations induced by the contacting superconducting layer result in the formation of a minigap and the characteristic length scales governing the response of the condensate will be different. In this work we use scanning tunneling spectroscopy to visualize the vortex states as a function of the applied magnetic field in a Au-MoGe nanostructure. By comparing the obtained zero-bias conductance maps with time-dependent Ginzburg-Landau simulations, we directly confirm that the observed vortex distributions can only be explained by taking into account the impact of the normal metallic layer. We illustrate this impact on the vortex state for two lithographically fabricated mesoscopic bilayer structures containing an identical antidot array but having different lateral sizes.
机译：双层普通金属超导薄膜中的超导冷凝物在整个层中具有不均匀的依赖性。对于足够薄的普通金属膜，由接触的超导层引起的超导相关导致形成最小间隙，并且控制冷凝物响应的特征长度尺度将不同。在这项工作中，我们使用扫描隧道光谱法将涡旋状态可视化为Au-MoGe纳米结构中所施加磁场的函数。通过将获得的零偏电导图与时间相关的Ginzburg-Landau模拟进行比较，我们直接确认观察到的涡旋分布只能通过考虑正常金属层的影响来解释。我们说明了对两个光刻制造的介观双层结构的涡流状态的影响，该双层结构包含相同的反点阵列但横向尺寸不同。

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  • 来源
    《Physical review》 |2019年第5期|054519.1-054519.7|共7页
  • 作者

    Panghotra Ritika; Timmermans Matias; Xue Cun; Raes Bart; Moshchalkov Victor; Van de Vondel Joris;

  • 作者单位

    Katholieke Univ Leuven Dept Phys & Astron Lab Solid State Phys & Magnetism Celestijnenlaan 200D B-3001 Leuven Belgium;

    Katholieke Univ Leuven Dept Phys & Astron Lab Solid State Phys & Magnetism Celestijnenlaan 200D B-3001 Leuven Belgium|CSIC Catalan Inst Nanosci & Nanotechnol ICN2 Campus UAB Barcelona 08193 Spain|BIST Campus UAB Barcelona 08193 Spain;

    Northwestern Polytech Univ Sch Mech Civil Engn & Architecture Xian 710072 Shaanxi Peoples R China|Northwestern Polytech Univ MIIT Key Lab Dynam & Control Complex Syst Xian 710072 Shaanxi Peoples R China;

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