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

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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.

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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).

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Authors and Affiliations

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

    Zhongxu Wei, Yujie Sun & Qi-Kun Xue

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

    Zhongxu Wei, Cui Ding, Lili Wang & Qi-Kun Xue

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

    Cui Ding & Qi-Kun Xue

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  1. Zhongxu Wei
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  2. Cui Ding
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Correspondence to Lili Wang or Qi-Kun Xue.

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Wei, Z., Ding, C., Sun, Y. et al. Preparation of spatially uniform monolayer FeSexTe1−x (0 < x ≤ 1) by topotactic reaction. Nano Res. 16, 1712–1716 (2023). https://doi.org/10.1007/s12274-022-4718-3

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