论文标题
通过超薄A-MOGE膜中的相位波动破坏超导性
Destruction of superconductivity through phase fluctuations in ultrathin a-MoGe films
论文作者
论文摘要
我们使用亚乳杆菌扫描隧穿光谱，磁穿透深度测量和磁铁转运测量的结合，研究了超导无形MOGE（A-MOGE）膜中膜厚度的变化。我们观察到，超导性受到低于5 nm的厚度的量子和经典相位波动的强烈影响。在低温下量子相波动强烈抑制了超流体密度，并在较高温度下向线性-T依赖性发展。这与超导过渡温度TC的快速降低以及在TC上方明显的伪模的出现有关。这些观察结果表明，在牢固的疾病中，超导性的破坏遵循了一条骨气途径，即使配对振幅仍然有限，全球超导状态也会因相波而破坏。
We investigate the evolution of superconductivity with decreasing film thickness in ultrathin amorphous MoGe (a-MoGe) films using a combination of sub-Kelvin scanning tunneling spectroscopy, magnetic penetration depth measurements and magneto-transport measurements. We observe that superconductivity is strongly affected by quantum and classical phase fluctuations for thickness below 5 nm. The superfluid density is strongly suppressed by quantum phase fluctuations at low temperatures and evolves towards a linear-T dependence at higher temperatures. This is associated with a rapid decrease in the superconducting transition temperature, Tc, and the emergence of a pronounced pseudogap above Tc. These observations suggest that at strong disorder the destruction of superconductivity follows a Bosonic route where the global superconducting state is destroyed by phase fluctuations even though the pairing amplitude remains finite.
