Full-Gap Superconductivity in BaAs/Ferropnictide Heterostructures
Interfacial interactions often promote the emergence of unusual phenomena in two-dimensional systems, including high-temperature superconductivity. Here, we report the observation of full-gap superconductivity with a maximal spectroscopic temperature up to 26 K in a BaAs monolayer grown on ferropnictide Ba(Fe_{1-x}Co_{x})_{2}As_{2} (abbreviated as BFCA) epitaxial films. The superconducting gap remains robust even when the thickness of underlying BFCA is reduced to the monolayer limit, in contrast to the rapid suppression of T_{c} in standalone BFCA thin films. We reveal that the exceptional crystallinity of the BaAs/BFCA heterostructures, featured by their remarkable electronic and geometric uniformities, is crucial for the emergent full-gap superconductivity with mean-field temperature dependence and pronounced bound states within magnetic vortices. Our findings open up new avenues to unravel the mysteries of unconventional superconductivity in ferropnictides and advance the development of FeAs-based heterostructures.
Authors
- Can‐Li Song (ORCID: https://orcid.org/0000-0002-4985-0968)
- Congcong Lou
- Lin Gu (ORCID: https://orcid.org/0000-0002-7504-031X)
- Ze-Xian Deng
- Fang-Jun Cheng
- Kai Liu (ORCID: https://orcid.org/0000-0001-6216-333X)
- Hui-Hui He
- Yongwei Wang (ORCID: https://orcid.org/0000-0001-8763-6674)
- Qiang-Jun Cheng
- Qinghua Zhang (ORCID: https://orcid.org/0000-0001-9086-7000)
- Qi‐Kun Xue
- Xu-Cun Ma
- Karl J. Friston
Institutions
- Chinese Academy of Sciences (CN)
- Southern University of Science and Technology (CN)
- Hefei University (CN)
- Hefei National Center for Physical Sciences at Nanoscale (CN)
- FZU ‒ Institute of Physics of the Academy of Sciences of the Czech Republic (CZ)
- Beijing Academy of Quantum Information Sciences (CN)
- Institute of Physics (CN)
- State Key Laboratory of Low-Dimensional Quantum Physics
- State Key Laboratory of New Ceramics and Fine Processing
- Renmin University of China (CN)
- Tsinghua University (CN)
Publication Details
- Journal
- Physical Review Letters
- Published
- 2025-05-28
- DOI
- https://doi.org/10.1103/jmrh-347m
- Citations
- 1
- Primary Topic
- Iron-based superconductors research
- Type
- article
- Field-Weighted Citation Impact
- 0.43
Funders
- Natural Science Foundation of Shenzhen City
- National Natural Science Foundation of China
- National Key Research and Development Program of China