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Strong Pauli paramagnetic effect in the upper critical field of KCa2Fe4As4F2

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Abstract

Recently, 12442 system of Fe-based superconductors has attracted considerable attention owing to its unique double-FeAs-layer structure. A steep increase in the in-plane upper critical field with cooling has been observed near the superconducting transition temperature, Tc, in KCa2Fe4As4F2 single crystals. Herein, we report a high-field investigation on upper critical field of this material over a wide temperature range, and both out-of-plane (\((H||{c},\;H_{c2}^c)\)) and in-plane (\((H||{ab},\;H_{c2}^{ab})\)) directions have been measured. A sublinear temperature-dependent behavior is observed for the out-of-plane \(H_{c2}^c\), whereas strong convex curvature with cooling is observed for the in-plane \(H_{c2}^{ab}\). Such behaviors could not be described by the conventional Werthamer-Helfand-Hohenberg (WHH) model. The data analysis based on the WHH model by considering the spin aspects reveals a large Maki parameter α = 9, indicating that the in-plane upper critical field is affected by a very strong Pauli paramagnetic effect.

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Authors and Affiliations

  1. State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai, 200050, China

    Teng Wang, Chi Zhang, JiaNan Chu, JiaXin Feng, LingLing Wang, Tao Hu, XiaoSong Liu & Gang Mu

  2. CAS Center for Excellence in Superconducting Electronics (CENSE), Shanghai, 200050, China

    Teng Wang, Chi Zhang, JiaNan Chu, JiaXin Feng, Tao Hu, XiaoSong Liu & Gang Mu

  3. School of Physical Science and Technology, ShanghaiTech University, Shanghai, 201210, China

    Teng Wang & XiaoSong Liu

  4. University of Chinese Academy of Sciences, Beijing, 100049, China

    Chi Zhang, JiaNan Chu & JiaXin Feng

  5. Wuhan National High Magnetic Field Center and School of Physics, Huazhong University of Science and Technology, Wuhan, 430074, China

    LiangCai Xu, JinHua Wang, Shan Jiang & ZengWei Zhu

  6. Anhui Province Key Laboratory of Condensed Matter Physics at Extreme Conditions, High Magnetic Field Laboratory of the Chinese Academy of Sciences, Hefei, 230031, China

    ZhaoSheng Wang

  7. Department of Physics and State Key Laboratory of Surface Physics, Fudan University, Shanghai, 200433, China

    Wei Li

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  1. Teng Wang
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Corresponding author

Correspondence to Gang Mu.

Additional information

This work was supported by the Youth Innovation Promotion Association of the Chinese Academy of Sciences (Grant No. 2015187), the National Natural Science Foundation of China (Grant Nos. 11204338, 11704385, and 11874359), and the “Strategic Priority Research Program (B)” of the Chinese Academy of Sciences (Grant No. XDB04040300). We thank Dr. X.Z. Xing for the help when handling the WHH model.

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Wang, T., Zhang, C., Xu, L. et al. Strong Pauli paramagnetic effect in the upper critical field of KCa2Fe4As4F2. Sci. China Phys. Mech. Astron. 63, 227412 (2020). https://doi.org/10.1007/s11433-019-1441-4

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