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- Title
Two-gap superconductivity in CaFe<sub>0.88</sub>Co<sub>0.12</sub>AsF revealed by temperature dependence of the lower critical field H<sub>c1</sub><sup>c</sup> (T).
- Authors
Wang, Teng; Ma, Yonghui; Li, Wei; Chu, Jianan; Wang, Lingling; Feng, Jiaxin; Xiao, Hong; Li, Zhuojun; Hu, Tao; Liu, Xiaosong; Mu, Gang
- Abstract
Gap symmetry and structure are crucial issues in understanding the superconducting mechanism of unconventional superconductors. Here, we report an in-depth investigation on the out-of-plane lower critical field H c 1 c of fluorine-based 1111 system superconductor CaFe0.88Co0.12AsF with Tc = 21 K. A pronounced two-gap feature is revealed by the kink in the temperature-dependent H c 1 c (T) curve. The magnitudes of the two gaps are determined to be Δ1 = 0.86 meV and Δ2 = 4.48 meV, which account for 74% and 26% of the total superfluid density, respectively. Our results suggest that the local antiferromagnetic exchange pairing picture is favored compared to the Fermi surface nesting scenario.
- Subjects
SUPERCONDUCTORS; SUPERCONDUCTIVITY; ANTIFERROMAGNETIC materials; SUPERFLUIDITY; FERMI surfaces
- Publication
NPJ Quantum Materials, 2019, Vol 4, Issue 1, pN.PAG
- ISSN
2397-4648
- Publication type
Article
- DOI
10.1038/s41535-019-0173-0