中国物理B ›› 2021, Vol. 30 ›› Issue (1): 17401-.doi: 10.1088/1674-1056/abcf95

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  • 收稿日期:2020-11-13 修回日期:2020-11-24 接受日期:2020-12-02 出版日期:2020-12-17 发布日期:2021-01-13

Physical properties and phase diagram of NaFe1 -xVxAs

Guang-Yang Dai(代光阳)1, 2, Xin He(何鑫)1, 2, Zhi-Wen Li(李芷文)1, 2, Chang-Ling Zhang(张昌玲)1, 2, Lu-Chuan Shi(史鲁川)1, 2, Run-Ze Yu(于润泽)1, Xian-Cheng Wang(望贤成)1,2,†, and Chang-Qing Jin(靳常青)1, 2, 3,‡   

  1. 1 Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China; 2 University of Chinese Academy of Sciences, Beijing 100190, China; 3 Materials Research Laboratory at Songshan Lake, Dongguan 523808, China
  • Received:2020-11-13 Revised:2020-11-24 Accepted:2020-12-02 Online:2020-12-17 Published:2021-01-13
  • Contact: Corresponding author. E-mail: wangxiancheng@iphy.ac.cn Corresponding author. E-mail: Jin@iphy.ac.cn
  • About author:Shen Chunxiu,(1979—),E-mail:shenchunxiu@126.com
  • Supported by:
    Project supported by the National Natural Science Foundation of China and the National Key Research and Development Program of China.

Abstract: We grew a series of NaFe1 -xVxAs (0 ≤ x ≤ 0.03) single crystals and performed the measurements of resistance, magnetic susceptibility, and specific heat to study the superconducting phase diagram by doping V into NaFeAs. Both the structural and the spin-density-wave (SDW) transitions are slightly suppressed by V-doping. While superconducting transition temperature is enhanced to the maximum value of ∼ 15 K when the optimal doping level x = 0.007 and then is suppressed rapidly with further V-doping, displaying a small superconducting dome. Our results suggest that V-impurities should act as strong magnetic scattering centers which cause the sharp suppression of superconductivity in NaFe1 - xVxAs.

Key words: iron based superconductor, "111" type NaFeAs, V doping, phase diagram

中图分类号:  (Pnictides and chalcogenides)

  • 74.70.Xa
74.25.Dw (Superconductivity phase diagrams) 74.25.-q (Properties of superconductors) 74.62.Dh (Effects of crystal defects, doping and substitution)