Effect of Mn substitution on superconductivity in iron selenide (Li, Fe)OHFeSe single crystals

ORAL

Abstract

We synthesize a series of Mn substituted (Li, Fe)OHFeSe superconductor single crystals via a modified ion-exchange method, with the Mn dopant concentration z (the atomic ratio of Mn:Se) ranging from zero to 0.07. Interestingly, we find that the superconducting transition temperature Tc and unit cell parameter c of the Mn-doped (Li, Fe)OHFeSe samples display similar V-shaped evolutions with the dopant concentration z. The Mn dopant may be accommodated in the tetrahedral sites of both the (Li, Fe)OH- and FeSe-layers depending on the doping level, leading to a reduced or enhanced interlayer separation of (Li, Fe)OHFeSe. The observed positive correlation between the Tc and lattice parameter c, regardless of the Mn doping level z, indicates that a larger interlayer separation, or a weaker interlayer coupling, is essential for the high-Tc superconductivity in (Li, Fe)OHFeSe.
Corresponding authors: dong@iphy.ac.cn, zhxzhao@iphy.ac.cn
References
1. Huaxue Zhou, et al., Chin. Phys. B 26, 057402 (2017)
2. Yiyuan Mao, et al., Chin. Phys. B 27, 077405 (2018)

*This work was supported by the National Key Research and Development Program of China (Grant Nos. 2017YFA0303003 and 2016YFA0300300), the National Natural Science Foundation of China (Grant Nos. 11574370).

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Presenters

  • Huaxue Zhou

    • Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China

Authors

  • Huaxue Zhou

    • Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China

  • Yiyuan Mao

    • Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China

  • Zian Li

    • Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China

  • Chai Ke

    • School of Physics, Beijing Institute of Technology, Beijing 100081, China

  • Shunli Ni

    • Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China

  • Mingwei Ma

    • Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China

  • Shaobo Liu

    • Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China

  • Jinpeng Tian

    • Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China

  • Yu Long Huang

    • Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China

  • Jie Yuan

    • Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
    • Institute of Physics, Chinese Academy of Sciences

  • Fang Zhou

    • Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China

  • Jianqi Li

    • Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China

  • kui jin

    • Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
    • Institute of Physics, Chinese Academy of Sciences

  • Xiaoli Dong

    • Institute of Physics, CAS
    • Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
    • Institute of Physics, Chinese Academy of Sciences

  • Zhongxian Zhao

    • Institute of Physics, CAS
    • Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China