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Tuning the interlayer spacing in intercalated FeSe-based superconductors through mixed solvent

混合溶剂调控插层FeSe基超导体的层间距

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Abstract

Recently, the exploration of novel intercalated FeSe-based superconductors through the wet chemical reactions has been a focal point in condensed matter physics. Here, we present the successful synthesis of two FeSe derivatives, namely Li0.34Se0.05(EG)0.14FeSe and Li0.21Se0.05(EG)0.26FeSe, whose c-axis lattice parameters are 9.93 Å and 13.85 Å, respectively, using the solvothermal ion-exchange technique. The interlayer spacing of the two FeSe derivatives can be tuned by the change of mixed solvent during the synthesis process. The resistivity and magnetic susceptibility measurement results show that their superconducting transition temperatures (Tc) are both about 30 K. Interestingly, the Tc values are found to be independent of the interlayer spacing of the FeSe layer. Compared with the pristine FeSe single crystal, X-ray photoelectron spectroscopy results display a decrease of the Fe valence, indicating that the enhancement in Tc may be caused by an electron doping effect. Our research provides valuable insights into the intercalation of FeSe-based superconductors and offers new possibilities for exploring novel intercalated materials within the field of superconductivity.

摘要

近年来, 通过湿化学方法探索合成新型插层FeSe基超导体一直是 凝聚态物理的研究热点之一. 本文中, 我们利用溶剂热离子交换技术成 功合成出两种FeSe衍生物: c轴晶胞参数为9.93 Å的Li0.34 Se0.05 (EG) 0.14 -FeSe和c轴晶胞参数为13.85 Å的Li0.21 Se0.05 (EG)0.26 FeSe. 通过调整反应溶 剂可以调控以上两种FeSe衍生物的层间距. 磁化率和电阻率测试表明 它们的超导转变温度(Tc)均为30 K左右, 似乎与FeSe层层间距的大小无 关. 与原始FeSe单晶相比, X射线光电子能谱结果显示FeSe层Fe的价态 降低, 这表明 Tc 的提高可能是由于电子掺杂效应引起的. 我们的研究为 探索合成插层铁基超导体提供了有价值的参考, 并为在超导领域探索 新型插层材料提供了新的可能性.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (12264052) and the Science and Technology Research Project of Jiangxi Provincial Department of Education (GJJ211607).

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Author notes

  1. These authors contributed equally to this work.

Authors and Affiliations

  1. Physical Science and Technology College, Yichun University, Yichun, 336000, China

    Guobing Hu  (胡国兵), Fengyun Jiang  (江风云), Min Gao  (高敏), Fan Zhong  (钟钒), Huan Chen  (陈欢) & Jingfeng Guo  (郭景锋)

  2. Key Laboratory of Strongly Coupled Quantum Matter Physics, Chinese Academy of Sciences, Hefei National Laboratory for Physical Sciences at Microscale, and Department of Physics, University of Science and Technology of China, Hefei, 230026, China

    Mengzhu Shi  (石孟竹), Fanbao Meng  (孟凡保) & Xigang Luo  (罗习刚)

Authors
  1. Guobing Hu  (胡国兵)
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  2. Mengzhu Shi  (石孟竹)
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  7. Huan Chen  (陈欢)
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  8. Jingfeng Guo  (郭景锋)
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  9. Xigang Luo  (罗习刚)
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Contributions

Author contributions Hu G conceived and coordinated the project, and is responsible for the infrastructure and project direction. Hu G, Zhong F and Guo J synthesized the samples; Meng F, Chen H and Gao M performed the experiments; Shi M, Meng F, Luo X and Jiang F analyzed the data; Hu G, Shi M and Meng F wrote the paper. All authors contributed to the general discussion.

Corresponding author

Correspondence to Guobing Hu  (胡国兵).

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Conflict of interest The authors declare that they have no conflict of interest.

Additional information

Supplementary information Experimental details and supporting data are available in the online version of the paper.

Guobing Hu obtained his PhD degree in physics from the University of Science and Technology of China (USTC) in 2021. Now he holds the position of lecturer in physics at Yichun University. His current research interest focuses on the exploration and characterization of layered superconductors.

Mengzhu Shi obtained his PhD degree in physics from the USTC in 2021. He is currently a postdoctoral fellow in Professor Xianhui Chen’s research group at the USTC. His current research interest focuses on the exploration and characterization of layered functional materials and layered superconductors.

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Hu, G., Shi, M., Meng, F. et al. Tuning the interlayer spacing in intercalated FeSe-based superconductors through mixed solvent. Sci. China Mater. 67, 295–300 (2024). https://doi.org/10.1007/s40843-023-2700-y

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  • DOI: https://doi.org/10.1007/s40843-023-2700-y

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