论文标题
无处不在的条纹阶段和增强的电子配对在界面高-TC超导体FESE/BATIO $ _3 $
Ubiquitous stripe phase and enhanced electron pairing in interfacial high-Tc superconductor FeSe/BaTiO$_3$
论文作者
论文摘要
Srtio $ _3 $生长的单层FESE为高-TC超导性提供了一个新的操场。最近的一项研究表明，条纹不稳定性对FESE/SRTIO3的超导性增强的重要性。但是，仍然存在争议，这种条纹阶段是否与界面超导性无处不在。在这里，我们报告了分子束外延生长和低温扫描隧道显微镜研究Batio $ _3 $（001）的FESE膜的研究。我们发现条纹阶段在FESE/BATIO $ _3 $中更为突出。双层和三层FESE膜中存在远距离条纹，在4 K处存在，甚至在双层FESE的情况下，甚至持续到77 K，在碱金属沉积时具有扩大的超导差距。结果指出了界面超导性与条纹阶段之间的紧密相关性。
Monolayer FeSe grown on SrTiO$_3$ provides a new playground for high-Tc superconductivity. A recent study shows the importance of stripy instability for superconductivity enhancement in FeSe/SrTiO3. However, it is still under debate whether such a stripe phase is ubiquitously bound to the interfacial superconductivity. Here, we report on molecular beam epitaxy growth and low-temperature scanning tunneling microscopy study of FeSe films on BaTiO$_3$(001). We find that the stripe phase is more prominent in FeSe/BaTiO$_3$. Long-range stripes exist in bilayer and triple-layer FeSe films at 4 K and even persist up to 77 K in the case of bilayer FeSe, with enlarged superconducting gaps upon alkali-metal deposition. The results point out an intimate correlation between the interfacial superconductivity and the stripe phase.
