Preparation of spatially uniform monolayer FeSexTe1-x (0 < x <= 1) by topotactic reaction

Wei, Zhongxu1,2; Ding, Cui2,3; Sun, Yujie1; Wang, Lili2; Xue, Qi-Kun1,2,3

2022-09-01

10.1007/s12274-022-4718-3

Nano Research   Impact Factor & Quartile

1998-0124

1998-0000

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 similar to 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.

monolayer FeSexTel_x interface superconductivity topotactic reaction scanning tunneling microscopy

SCI

English

First ; Corresponding

National Natural Science Foundation of China["12074210","51788104","11790311"] ; National Basic Research Program of China[2017YFA0303303] ; Basic and Applied Basic Research Major Programme of Guangdong Province, China[2021B0301030003] ; Jihua Laboratory[X210141TL210]

Chemistry ; Science & Technology - Other Topics ; Materials Science ; Physics

Chemistry, Physical ; Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary ; Physics, Applied

WOS:000849173500001

TSINGHUA UNIV PRESS

Web of Science

1.Southern Univ Sci & Technol, Dept Phys, Shenzhen 518055, Peoples R China
2.Tsinghua Univ, Dept Phys, State Key Lab Low Dimens Quantum Phys, Beijing 10008, Peoples R China
3.Beijing Acad Quantum Informat Sci, Beijing 100193, Peoples R China

Wei, Zhongxu,Ding, Cui,Sun, Yujie,et al. Preparation of spatially uniform monolayer FeSexTe1-x (0 < x <= 1) by topotactic reaction[J]. Nano Research,2022.

Wei, Zhongxu,Ding, Cui,Sun, Yujie,Wang, Lili,&Xue, Qi-Kun.(2022).Preparation of spatially uniform monolayer FeSexTe1-x (0 < x <= 1) by topotactic reaction.Nano Research.

Wei, Zhongxu,et al."Preparation of spatially uniform monolayer FeSexTe1-x (0 < x <= 1) by topotactic reaction".Nano Research (2022).