期刊
SCIENCE
卷 337, 期 6100, 页码 1314-1317出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1222793
关键词
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资金
- Japan Society for the Promotion of Science (JSPS) through its FIRST Program
- JSPS [24340090]
- Ministry of Education, Culture, Sports, Science and Technology (MEXT) [21540351, 22684016, 20102005, 21102505]
- KAKENHI from JSPS
- Grants-in-Aid for Scientific Research [23654118, 23654119, 23102713, 22684016, 21540351, 20224008, 22104010, 20102005, 11J06478, 20102006] Funding Source: KAKEN
In iron-pnictide superconductivity, the interband interaction between the hole and electron Fermi surfaces (FSs) is believed to play an important role. However, KFe2As2 has three zone-centered hole FSs and no electron FS but still exhibits superconductivity. Our ultrahigh-resolution laser angle-resolved photoemission spectroscopy unveils that KFe2As2 is a nodal s-wave superconductor with highly unusual FS-selective multi-gap structure: a nodeless gap on the inner FS, an unconventional gap with octet-line nodes on the middle FS, and an almost-zero gap on the outer FS. This gap structure may arise from the frustration between competing pairing interactions on the hole FSs causing the eightfold sign reversal. Our results suggest that the A(1g) superconducting symmetry is universal in iron-pnictides, in spite of the variety of gap functions.
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