Journal
PHYSICAL REVIEW LETTERS
Volume 108, Issue 3, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.108.037002
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Funding
- JSPS
- TRiP-JST
- CREST-JST
- MEXT of Japan
- NSFC
- Chinese Academy of Sciences
- NSF
- Ministry of Science and Technology of China
- Grants-in-Aid for Scientific Research [21340088] Funding Source: KAKEN
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We have performed high-resolution angle-resolved photoemission spectroscopy on Fe-based superconductor LiFeAs (T-c = 18 K). We reveal multiple nodeless superconducting (SC) gaps with 2 Delta/k(B)T(c) ratios varying from 2.8 to 6.4, depending on the Fermi surface (FS). We also succeeded in directly observing a gap anisotropy along the FS with magnitude up to similar to 30%. The anisotropy is fourfold symmetric with an antiphase between the hole and electron FSs, suggesting complex anisotropic interactions for the SC pairing. The observed momentum dependence of the SC gap offers an excellent opportunity to investigate the underlying pairing mechanism.
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