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
Abstract This study systematically investigates the transport and point-contact Andreev reflection spectroscopy (PCARS) properties of Bi-doped BaFe (AsBi) crystals under high pressures up to 8.7 GPa. The superconducting critical temperature () and upper critical field () 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.
Fund: 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).
Corresponding Authors:
Jinlong Zhu, Lingyi Xing, Ying Liu
E-mail: zhujl@sustech.edu.cn;xinglingyi@hbnu.edu.cn;liuying@quantumsc.cn
Cite this article:
Chang Su(苏畅), Wuhao Chen(陈吴昊), Wenjing Cheng(程文静), Jiabin Si(司佳斌), Qunfei Zheng(郑群飞), Jinlong Zhu(朱金龙), Lingyi Xing(邢令义), and Ying Liu(刘影) Pressure-induced superconductivity in Bi-doped BaFe2(As1-xBix)2 single crystals 2025 Chin. Phys. B 34 067403
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