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arXiv 2112.04530cond-mat.supr-con
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非晶超导薄膜内禀表面磁无序的直接观测

Direct observation of intrinsic surface magnetic disorder in amorphous superconducting films

Idan Tamir, Martina Trahms, Franzisca Gorniaczyk, Felix von Oppen, Dan Shahar, Katharina J. Franke

摘要:

无序和相互作用之间的相互作用可以显著地影响薄膜超导体的物理性质。在最极端的情况下,当绝缘相出现时,强无序能够抑制超导性。由于磁无序对超导体的破坏势是已知的,因此研究的重点是非磁无序对超导体的影响。在这里,我们提供了直接的证据表明,磁无序也存在于非晶超导薄膜的表面。这种磁无序甚至在没有磁性杂质原子的情况下也存在,并且与表面终止本身密切相关。虽然大块超导性在足够厚的薄膜中生存,我们认为磁无序可能会对薄膜极限中的超导体到绝缘体的转变产生至关重要的影响。

英文摘要:

The interplay between disorder and interactions can dramatically influence the physical properties of thin-film superconductors. In the most extreme case, strong disorder is able to suppress superconductivity as an insulating phase emerges. Due to the known pair-breaking potential of magnetic disorder on superconductors, the research focus is on the influence of non-magnetic disorder. Here we provide direct evidence that magnetic disorder is also present at the surface of amorphous superconducting films. This magnetic disorder is present even in the absence of magnetic impurity atoms and is intimately related to the surface termination itself. While bulk superconductivity survives in sufficiently thick films, we suggest that magnetic disorder may crucially affect the superconductor-to-insulator transition in the thin-film limit.

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