Pressure-induced superconductivity in Bi-doped BaFe<sub>2</sub>(As<sub>1–<i>x</i> </sub>Bi<sub> <i>x</i> </sub>)<sub>2</sub> single crystals
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 c ) and upper critical field ( H 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.
Authors
- Jinlong Zhu (ORCID: https://orcid.org/0000-0002-4062-0963)
- Lingyi Xing
- Wuhao Chen
- Qunfei Zheng (ORCID: https://orcid.org/0009-0008-5629-0410)
- Ying Liu (ORCID: https://orcid.org/0000-0001-6016-3184)
- Wenjing Cheng
- Chang Su (ORCID: https://orcid.org/0000-0002-1077-3248)
- Jiabin Si
Institutions
- Southern University of Science and Technology (CN)
- Shenzhen Bay Laboratory (CN)
- Hubei Normal University (CN)
Publication Details
- Journal
- Chinese Physics B
- Published
- 2025-04-09
- DOI
- https://doi.org/10.1088/1674-1056/adcaa0
- Primary Topic
- Iron-based superconductors research
- Type
- article
- Field-Weighted Citation Impact
- 0.00