@article{Wei2023, 
author = {Zhongxu Wei and Cui Ding and Yujie Sun and Lili Wang and Qi-Kun Xue},
title = {Preparation of spatially uniform monolayer FeSexTe1−x (0 < x ≤ 1) by topotactic reaction},
year = {2023},
journal = {Nano Research},
volume = {16},
number = {1},
pages = {1712-1716},
keywords = {scanning tunneling microscopy, monolayer FeSexTe1−x, interface superconductivity, topotactic reaction},
url = {https://www.sciopen.com/article/10.1007/s12274-022-4718-3},
doi = {10.1007/s12274-022-4718-3},
abstract = {Spatially uniform high-temperature superconducting films are highly desirable for exploring novel properties and popularizing applications. To improve the uniformity, we fabricate monolayer FeSexTe1−x (0 < x ≤ 1) films on SrTiO3(001) by topotactic reaction of monolayer FeTe films with selenium. Using in situ low-temperature scanning tunneling microscopy/spectroscopy, we demonstrate atomic-level uniformity of element distribution and well-defined superconducting gaps of ~ 15 meV in FeSexTe1−x films. In particular, the monolayer FeSe films exhibit fewer line defects and higher superfluid density as evidenced by sharper coherence peaks than those prepared by the co-evaporation method. Our results provide a promising way to optimize sample quality and lay a foundation for studying new physics and drawing reliable conclusions.}
}