中国物理B ›› 2025, Vol. 34 ›› Issue (6): 67403-067403.doi: 10.1088/1674-1056/adcaa0

所属专题： SPECIAL TOPIC — Structures and properties of materials under high pressure

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Pressure-induced superconductivity in Bi-doped BaFe2(As1-xBix)2 single crystals

Chang Su(苏畅)1,†, Wuhao Chen(陈吴昊)2,†, Wenjing Cheng(程文静)1, Jiabin Si(司佳斌)3, Qunfei Zheng(郑群飞)1, Jinlong Zhu(朱金龙)1,2,4,‡, Lingyi Xing(邢令义)3,§, and Ying Liu(刘影)2,4,¶   

  1. 1 Department of Physics, Southern University of Science and Technology, Shenzhen 518055, China;
    2 Quantum Science Center of Guangdong-Hong Kong-Macao Greater Bay Area (Guangdong), Shenzhen 518045, China;
    3 College of Physics and Electronic Science, Hubei Normal University, Huangshi 435002, China;
    4 Institute of Major Scientific Facilities for New Materials, Southern University of Science and Technology, Shenzhen 518055, China
  • 收稿日期:2025-02-08 修回日期:2025-03-28 接受日期:2025-04-09 出版日期:2025-05-16 发布日期:2025-05-16
  • 通讯作者: Jinlong Zhu, Lingyi Xing, Ying Liu E-mail:zhujl@sustech.edu.cn;xinglingyi@hbnu.edu.cn;liuying@quantumsc.cn
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 12461160274 and 12004104) and Shenzhen Fundamental Research Program (Grant No. JCYJ20230807093301003). J. L. Zhu and Y. L also acknowledged the Major Science and Technology Infrastructure Project of Material Genome Big-science Facilities Platform supported by Municipal Development and Reform Commission of Shenzhen. The work was also supported by Guangdong Provincial Quantum Science Strategic Initiative (Grant No. GDZX2201001).

Pressure-induced superconductivity in Bi-doped BaFe2(As1-xBix)2 single crystals

Chang Su(苏畅)1,†, Wuhao Chen(陈吴昊)2,†, Wenjing Cheng(程文静)1, Jiabin Si(司佳斌)3, Qunfei Zheng(郑群飞)1, Jinlong Zhu(朱金龙)1,2,4,‡, Lingyi Xing(邢令义)3,§, and Ying Liu(刘影)2,4,¶   

  1. 1 Department of Physics, Southern University of Science and Technology, Shenzhen 518055, China;
    2 Quantum Science Center of Guangdong-Hong Kong-Macao Greater Bay Area (Guangdong), Shenzhen 518045, China;
    3 College of Physics and Electronic Science, Hubei Normal University, Huangshi 435002, China;
    4 Institute of Major Scientific Facilities for New Materials, Southern University of Science and Technology, Shenzhen 518055, China
  • Received:2025-02-08 Revised:2025-03-28 Accepted:2025-04-09 Online:2025-05-16 Published:2025-05-16
  • Contact: Jinlong Zhu, Lingyi Xing, Ying Liu E-mail:zhujl@sustech.edu.cn;xinglingyi@hbnu.edu.cn;liuying@quantumsc.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 12461160274 and 12004104) and Shenzhen Fundamental Research Program (Grant No. JCYJ20230807093301003). J. L. Zhu and Y. L also acknowledged the Major Science and Technology Infrastructure Project of Material Genome Big-science Facilities Platform supported by Municipal Development and Reform Commission of Shenzhen. The work was also supported by Guangdong Provincial Quantum Science Strategic Initiative (Grant No. GDZX2201001).

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摘要： This study systematically investigates the transport and point-contact Andreev reflection spectroscopy (PCARS) properties of Bi-doped BaFe$_2$ (As$_{1-x}$Bi$_x$)$_2$ crystals under high pressures up to 8.7 GPa. The superconducting critical temperature ($T_{\rm c}$) and upper critical field ($H_{\rm c2}$) initially decrease with pressure but exhibit a local maximum around 2.9 GPa before further suppression, which can be related to the superconducting transition in the parent compound. The conductance spectrum is consistent with a two-band s-wave model, confirming multi-band superconductivity. The superconducting energy gaps and coupling strengths decrease monotonically with pressure, with the larger gap transitioning from strong to weak coupling. These results provide insight into the interplay between structural, electronic, and superconducting properties in isovalent-doped 122 Fe-based superconductors.

关键词: BaFe$_2$As$_2$, superconductivity, high pressure, diamond anvil cell

Abstract: This study systematically investigates the transport and point-contact Andreev reflection spectroscopy (PCARS) properties of Bi-doped BaFe$_2$ (As$_{1-x}$Bi$_x$)$_2$ crystals under high pressures up to 8.7 GPa. The superconducting critical temperature ($T_{\rm c}$) and upper critical field ($H_{\rm c2}$) initially decrease with pressure but exhibit a local maximum around 2.9 GPa before further suppression, which can be related to the superconducting transition in the parent compound. The conductance spectrum is consistent with a two-band s-wave model, confirming multi-band superconductivity. The superconducting energy gaps and coupling strengths decrease monotonically with pressure, with the larger gap transitioning from strong to weak coupling. These results provide insight into the interplay between structural, electronic, and superconducting properties in isovalent-doped 122 Fe-based superconductors.

Key words: BaFe$_2$As$_2$, superconductivity, high pressure, diamond anvil cell

中图分类号:  (Effects of pressure)

  • 74.62.Fj
74.70.Dd (Ternary, quaternary, and multinary compounds)