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Chin. Phys. B, 2021, Vol. 30(1): 017401    DOI: 10.1088/1674-1056/abcf95
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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 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
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.
Keywords:  iron based superconductor      "111" type NaFeAs      V doping      phase diagram  
Received:  13 November 2020      Revised:  24 November 2020      Accepted manuscript online:  02 December 2020
PACS:  74.70.Xa (Pnictides and chalcogenides)  
  74.25.Dw (Superconductivity phase diagrams)  
  74.25.-q (Properties of superconductors)  
  74.62.Dh (Effects of crystal defects, doping and substitution)  
Fund: Project supported by the National Natural Science Foundation of China and the National Key Research and Development Program of China.
Corresponding Authors:  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

Cite this article: 

Guang-Yang Dai(代光阳), Xin He(何鑫), Zhi-Wen Li(李芷文), Chang-Ling Zhang(张昌玲), Lu-Chuan Shi(史鲁川), Run-Ze Yu(于润泽), Xian-Cheng Wang(望贤成), and Chang-Qing Jin(靳常青) Physical properties and phase diagram of NaFe1 -xVxAs 2021 Chin. Phys. B 30 017401

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