标题： 金膜在外延生长于元素超导体V(100)、Nb(100)和Nb(110)表面的研究 显示英文标题

标题： Epitaxial growth of gold films on the elemental superconductors V(100), Nb(100) and Nb(110)

摘要： 量子技术需要新一代的超导电子器件和电路。然而，用于构建它们的超导材料被限制在一类块状超导体中。与超导材料接触生长的金膜可以通过邻近效应表现出超导关联，并在量子技术中有多种可能的应用。 在这里，我们通过低温扫描隧道显微镜（STM）和X射线光电子能谱（XPS）的结合研究了在元素超导体钒和铌的各种表面上生长平整金膜的过程。特别是，我们研究了生长形态和成分随温度和覆盖度的变化情况。 我们发现，当退火到足够高的温度时，金膜可以生长得平坦且无氧；然而，它们也容易与基底元素部分混合。低温扫描隧道光谱（STS）测量揭示了金表面出现邻近化超导间隙的现象。此外，我们证明了这些金膜表面的FeTPP-Cl分子的磁态得以保存，表明它们作为探测分子磁性的良好支撑物。我们发现，分子自旋与超导凝聚体之间的交换相互作用可以通过亚隙Yu-Shiva-Rusinov态的测量来推断。我们的工作表明，邻近化的金膜构成了一个有前景的平台，用于探索超导表面合成以及在大自旋轨道耦合环境中超导性和磁性之间的相互作用。 显示英文摘要

摘要： Quantum technologies require a new generation of superconducting electronic devices and circuitry. However, the superconducting materials used to construct them are restricted to a class of bulk superconductors. Gold films grown in contact with superconducting materials can exhibit superconducting correlations through the proximity effect, with various possible implementations in quantum technology. Here, we study the growth of flat Au films on various surfaces of the elemental superconductors vanadium and niobium through a combination of low-temperature scanning tunneling microscopy (STM) and X-ray photoelectron spectroscopy (XPS). In particular, we investigate the growth morphology and composition as a function of temperature and coverage. We find that gold films can grow flat and oxygen-free when annealed to sufficiently high temperatures; however, they are also susceptible to partial intermixing with the substrate elements. Low-temperature scanning tunneling spectroscopy (STS) measurements elucidate the emergence of a proximitized superconducting gap at the gold surface. Additionally, we demonstrate the survival of the magnetic state of FeTPP-Cl molecules on the surface of these gold films, proving that they behave as a good support for probing molecular magnetism. We found that the exchange interaction between the molecular spin and the superconducting condensate can be inferred by the measurement of sub-gap Yu-Shiva-Rusinov states. Our work shows that proximitised Au films constitute a promising platform to explore on-superconducting-surface synthesis and the interaction between superconductivity and magnetism in a large spin-orbit coupling environment.