中国物理B ›› 2022, Vol. 31 ›› Issue (11): 117401-117401.doi: 10.1088/1674-1056/ac834a

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Growth and characterization of superconducting Ca1-xNaxFe2As2 single crystals by NaAs-flux method

Hong-Lin Zhou(周宏霖)1,2,†, Yu-Hao Zhang(张与豪)3,†, Yang Li(李阳)1,2, Shi-Liang Li(李世亮)1,2,4, Wen-Shan Hong(洪文山)1,2,5,‡, and Hui-Qian Luo(罗会仟)1,4,§   

  1. 1 Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
    2 University of Chinese Academy of Sciences, Beijing 100049, China;
    3 School of Advanced Engineering, University of Science and Technology Beijing, Beijing 100083, China;
    4 Songshan Lake Materials Laboratory, Dongguan 523808, China;
    5 International Center for Quantum Materials, School of Physics, Peking University, Beijing 100871, China
  • 收稿日期:2022-06-23 修回日期:2022-07-12 接受日期:2022-07-22 出版日期:2022-10-17 发布日期:2022-10-17
  • 通讯作者: Wen-Shan Hong, Hui-Qian Luo E-mail:wenshanhong@pku.edu.cn;hqluo@iphy.ac.cn
  • 基金资助:
    Project supported by the National Key Research and Development Program of China (Grant No. 2018YFA0704200), the National Natural Science Foundation of China (Grant Nos. 11822411 and 11961160699), the Strategic Priority Research Program (B) of the CAS (Grants Nos. XDB25000000 and XDB33000000), the K. C. Wong Education Foundation (Grant No. GJTD-2020-01), the Youth Innovation Promotion Association of CAS (Grant No. Y202001), the Postdoctoral Innovative Talent program (Grant No. BX2021018), and the China Postdoctoral Science Foundation (Grant No. 2021M700250).

Growth and characterization of superconducting Ca1-xNaxFe2As2 single crystals by NaAs-flux method

Hong-Lin Zhou(周宏霖)1,2,†, Yu-Hao Zhang(张与豪)3,†, Yang Li(李阳)1,2, Shi-Liang Li(李世亮)1,2,4, Wen-Shan Hong(洪文山)1,2,5,‡, and Hui-Qian Luo(罗会仟)1,4,§   

  1. 1 Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
    2 University of Chinese Academy of Sciences, Beijing 100049, China;
    3 School of Advanced Engineering, University of Science and Technology Beijing, Beijing 100083, China;
    4 Songshan Lake Materials Laboratory, Dongguan 523808, China;
    5 International Center for Quantum Materials, School of Physics, Peking University, Beijing 100871, China
  • Received:2022-06-23 Revised:2022-07-12 Accepted:2022-07-22 Online:2022-10-17 Published:2022-10-17
  • Contact: Wen-Shan Hong, Hui-Qian Luo E-mail:wenshanhong@pku.edu.cn;hqluo@iphy.ac.cn
  • Supported by:
    Project supported by the National Key Research and Development Program of China (Grant No. 2018YFA0704200), the National Natural Science Foundation of China (Grant Nos. 11822411 and 11961160699), the Strategic Priority Research Program (B) of the CAS (Grants Nos. XDB25000000 and XDB33000000), the K. C. Wong Education Foundation (Grant No. GJTD-2020-01), the Youth Innovation Promotion Association of CAS (Grant No. Y202001), the Postdoctoral Innovative Talent program (Grant No. BX2021018), and the China Postdoctoral Science Foundation (Grant No. 2021M700250).

摘要: High-quality superconducting Ca$_{1-x}$Na$_x$Fe$_2$As$_2$ single crystals have been successfully grown by the NaAs-flux method, with sodium doping level $x = 0.4$-0.64. The typical sizes of these crystals are more than 10 mm in $ab$-plane and $\sim 0.1$ mm along $c$-axis in thickness. X-ray diffraction, resistance and magnetization measurements are carried out to characterize the quality of these crystals. While no signature of magnetic phase transitions is detected in the normal state, bulk superconductivity is found for these samples, with a sharp transition at $T_{\rm c}$ ranging from 19.8 K ($x = 0.4$) to 34.8 K ($x = 0.64$). The doping dependences of the $c$-axis parameter and $T_{\rm c}$ are consistent with previous reports, suggesting a possible connection between the lattice parameters and superconductivity.

关键词: iron-based superconductors, crystal growth, flux method

Abstract: High-quality superconducting Ca$_{1-x}$Na$_x$Fe$_2$As$_2$ single crystals have been successfully grown by the NaAs-flux method, with sodium doping level $x = 0.4$-0.64. The typical sizes of these crystals are more than 10 mm in $ab$-plane and $\sim 0.1$ mm along $c$-axis in thickness. X-ray diffraction, resistance and magnetization measurements are carried out to characterize the quality of these crystals. While no signature of magnetic phase transitions is detected in the normal state, bulk superconductivity is found for these samples, with a sharp transition at $T_{\rm c}$ ranging from 19.8 K ($x = 0.4$) to 34.8 K ($x = 0.64$). The doping dependences of the $c$-axis parameter and $T_{\rm c}$ are consistent with previous reports, suggesting a possible connection between the lattice parameters and superconductivity.

Key words: iron-based superconductors, crystal growth, flux method

中图分类号:  (Properties of superconductors)

  • 74.25.-q
74.25.Dw (Superconductivity phase diagrams) 74.70.-b (Superconducting materials other than cuprates) 74.25.F- (Transport properties)