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Co-doping effects on magnetism and superconductivity in the 112-type EuFeAs2 system

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Abstract

The discovery of EuFeAs2, currently the only charge-neutral parent phase of the 112-type iron-pnictide system, provides a new platform for the study of elemental doping effects on magnetism and superconductivity (SC). In this study, a series of polycrystalline EuFe1−yCoyAs2 and Eu0.9Pr0.1Fe1−yCoyAs2 samples are synthesized through solid-state reaction, and the evolutions of SC and magnetism with Co doping in EuFeAs2 and Eu0.9Pr0.1FeAs2 are investigated by electrical transport and magnetic susceptibility measurements. For EuFe1−yCoyAs2, the Eu-related antiferromagnetic (AFM) transition around 40 K is barely affected by Co doping, while the Fe-related spin density wave (SDW) transition temperature drops rapidly. Meanwhile, SC is induced by a trace amount of Co doping, with a highest transition temperature Tc∼28 K found in EuFe0.9Co0.1As2. For the Eu0.9Pr0.1Fe1−yCoyAs2 series, the magnetism and superconductivity show similar evolutions upon Co doping, and the highest Tc is enhanced to 30.6 K with an optimum doping level y ∼ 0.07. Our results shed light on the competition between SC and SDW with Co doping in the 112-type EuFeAs2 system.

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  1. These authors contributed equally to this work.

Authors and Affiliations

  1. Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences, Beijing, 100190, China

    Jia Yu, Tong Liu, BinBin Ruan, Kang Zhao, QingSong Yang, MengHu Zhou & ZhiAn Ren

  2. School of Physical Sciences, University of Chinese Academy of Sciences, Beijing, 100049, China

    Tong Liu, Kang Zhao, QingSong Yang & ZhiAn Ren

  3. Songshan Lake Materials Laboratory, Dongguan, 523808, China

    BinBin Ruan, MengHu Zhou & ZhiAn Ren

  4. School of Physics, Sun Yat-sen University, Guangzhou, 510275, China

    Jia Yu

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  1. Jia Yu
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Correspondence to ZhiAn Ren.

Additional information

This work was supported by the National Natural Science Foundation of China (Grant No. 11774402), and the National Key Research Program of China (Grant Nos. 2018YFA0704200, and 2016YFA0300301).

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Yu, J., Liu, T., Ruan, B. et al. Co-doping effects on magnetism and superconductivity in the 112-type EuFeAs2 system. Sci. China Phys. Mech. Astron. 64, 267411 (2021). https://doi.org/10.1007/s11433-020-1685-3

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