Preparation of spatially uniform monolayer FeSexTe1−x (0 &lt; x ≤ 1) by topotactic reaction

Zhongxu Wei; Cui Ding; Yujie Sun; Lili Wang; Qi-Kun Xue

doi:10.1007/s12274-022-4718-3

Nano Research 2023, 16(1): 1712-1716 https://doi.org/10.1007/s12274-022-4718-3

Research Article | Issue | Published: 02 September 2022

Preparation of spatially uniform monolayer FeSe_xTe_1−x (0 < x ≤ 1) by topotactic reaction

Show Author's Information Hide Author's Information Zhongxu Wei^{¹^,²}, Cui Ding^{³^,²}, Yujie Sun^¹, Lili Wang^²(

), Qi-Kun Xue^{¹^,²^,³}(

)

1Department of Physics, Southern University of Science and Technology, Shenzhen 518055, China

2State Key Laboratory of Low-Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing 10008, China

3Beijing Academy of Quantum Information Sciences, Beijing 100193, China

Keywords:

scanning tunneling microscopy, monolayer FeSe_xTe_1−x, interface superconductivity, topotactic reaction

Topics:

Epitaxial growth Monolayers Scanning tunneling microscopy

Cite this article:

Wei Z, Ding C, Sun Y, et al. Preparation of spatially uniform monolayer FeSe_xTe_1−x (0 < x ≤ 1) by topotactic reaction. Nano Research, 2023, 16(1): 1712-1716. https://doi.org/10.1007/s12274-022-4718-3

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Abstract Full text About this article

Abstract

Spatially uniform high-temperature superconducting films are highly desirable for exploring novel properties and popularizing applications. To improve the uniformity, we fabricate monolayer FeSe_xTe_1−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 FeSe_xTe_1−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.

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About this article

Preparation of spatially uniform monolayer FeSe_xTe_1−x (0 < x ≤ 1) by topotactic reaction

Show Author's information Hide Author's Information Zhongxu Wei^{¹^,²}, Cui Ding^{³^,²}, Yujie Sun^¹, Lili Wang^²(

), Qi-Kun Xue^{¹^,²^,³}(

)

1Department of Physics, Southern University of Science and Technology, Shenzhen 518055, China

2State Key Laboratory of Low-Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing 10008, China

3Beijing Academy of Quantum Information Sciences, Beijing 100193, China

Abstract

Keywords: scanning tunneling microscopy, monolayer FeSe_xTe_1−x, interface superconductivity, topotactic reaction

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About this article

Publication history

Acknowledgements

Publication history

Received: 17 May 2022

Revised: 23 June 2022

Accepted: 29 June 2022

Published: 02 September 2022

Issue date: January 2023

Copyright

Acknowledgements

This work was supported by the National Natural Science Foundation of China (Nos. 12074210, 51788104 and 11790311), the National Basic Research Program of China (Nos. 2017YFA0303303), and the Basic and Applied Basic Research Major Programme of Guangdong Province, China (No. 2021B0301030003) and Jihua Laboratory (No. X210141TL210).