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The Superconducting Phase Diagram of ThFe1−xNixAsN

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Abstract

Differently from most of the other 1111-type iron-based superconductors (IBSCs), ThFeAsN without an antiferromagnetic order shows superconductivity at 30 K in the absence of chemical doping and other treating. In order to enhance its superconductivity and understand its peculiar superconducting behaviour, it is necessary to investigate the evolution of the superconducting phase through electron doping, especially heavy electron doping. Chemically, the doping of Ni is an effective way to realize heavy electron doping, as Ni atoms have two more 3d electrons than Fe atoms and electrons could be doped directly into the FeAs planes. As is known that ThFeAsN is a kind of unconventional superconductor, while ThNiAsN is a kind of conventional superconductor, then if ThFeAsN is doped with Ni to form ThFe1−xNixAsN, some intriguing behaviours such as the phase transition from unconventional superconductivity to conventional superconductivity may be observed. Here, we have synthesized ThFe1−xNixAsN with 0.01 ≤ x ≤ 1. It is found that, with doping of Ni, the superconductivity of ThFeAsN is suppressed quickly. For ThNiAsN resynthesized by us, its Tc is 4.8 K, which is higher than the previously reported value of Tc = 4.3 K. The superconducting phase diagram of ThFe1−xNixAsN is drawn to summarize the doping results. Considering the other electron doping results of ThFeAsN1−xOx and ThFe1−xCoxAsN, it can be concluded that the electron doping is not an effective way to increase the Tc of ThFeAsN. The hole doping result is expected. Being associated with the previous results, it can be concluded that the superconductivity of ThFeAsN is much more sensitive to in-plane disorder than that of doped LaFeAsO, which reveals again that their superconductivity mechanisms are really different.

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Funding

This work was financially supported by the National Natural Science Foundation of China (Grant No. 11804194) and Natural Science Foundation of Shandong Province, China (Grant Nos. ZR2016AQ08, ZR2019MA036).

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Authors and Affiliations

  1. Laboratory of Functional Molecules and Materials, School of Physics and Optoelectronic Engineering, Shandong University of Technology, 266 Xincun Xi Road, Zibo, 255000, China

    Fei Jiao, Xianyu Wang, Jingfeng Wang, Lingbo Cai, Shu Zhu, Zichen Liu, Fuxiang Zhang, Qing Lu, Yuxue Mei, Shugang Tan, Qiang Jing, Cao Wang & Bo Liu

  2. School of Materials Science and Engineering, Shandong University of Technology, 266 Xincun Xi Road, Zibo, 255000, China

    Fei Jiao & Xianyu Wang

  3. Department of Physics, Zhejiang University, Hangzhou, 310027, China

    Baizhuo Li

  4. Key Laboratory of Artificial Structures and Quantum Control (Ministry of Education), School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai, 200240, China

    Qiang Jing

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  1. Fei Jiao
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  2. Xianyu Wang
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  3. Jingfeng Wang
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  8. Baizhuo Li
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  9. Qing Lu
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  11. Shugang Tan
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  12. Qiang Jing
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  13. Cao Wang
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  14. Bo Liu
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Correspondence to Qiang Jing, Cao Wang or Bo Liu.

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Jiao, F., Wang, X., Wang, J. et al. The Superconducting Phase Diagram of ThFe1−xNixAsN. J Supercond Nov Magn 34, 409–415 (2021). https://doi.org/10.1007/s10948-020-05660-6

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  • DOI: https://doi.org/10.1007/s10948-020-05660-6

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