Journal
NATURE PHYSICS
Volume 14, Issue 2, Pages 134-+Publisher
NATURE PORTFOLIO
DOI: 10.1038/NPHYS4299
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Funding
- National Key R&D Program of China [2016YFA0300400]
- National Natural Science Foundation of China (NSFC) [A0402/11534005, A0402/11190023, A0402/11374144]
- Natural Science Foundation of Jiangsu [BK20140015]
- ONR through the NRL
- DFG-ANR [ER 463/8-1]
- DAAD PPP USA [N57316180]
- [NSF-DMR-1407502]
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1407502] Funding Source: National Science Foundation
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Iron pnictides are the only known family of unconventional high-temperature superconductors besides cuprates. Until recently, it was widely accepted that superconductivity is driven by spin fluctuations and intimately related to the fermiology, specifically, hole and electron pockets separated by the same wavevector that characterizes the dominant spin fluctuations, and supporting order parameters (OP) of opposite signs(1,2). This picture was questioned after the discovery of intercalated or monolayer form of FeSe-based systems without hole pockets, which seemingly undermines the basis for spin-fluctuation theory and the idea of a sign-changing OP3-11. Using the recently proposed phase-sensitive quasiparticle interference technique, here we show that in LiOH-intercalated FeSe compound the OP does change sign, albeit within the electronic pockets. This result unifies the pairing mechanism of iron-based superconductors with or without the hole Fermi pockets and supports the conclusion that spin fluctuations play the key role in electron pairing.
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