期刊
SCIENCE
卷 357, 期 6346, 页码 76-+出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.aal1575
关键词
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资金
- Moore Foundation's EPiQS (Emergent Phenomena in Quantum Physics) Initiative [GBMF4544, GBMF4411]
- Tyndall National Institute, University College Cork, Cork, Ireland
- U.S. Department of Energy (DOE) grant [DE-FG02-05ER46236]
- Lundbeckfond Fellowship [A9318]
- U.S. DOE, Office of Basic Energy Science, Division of Materials Sciences and Engineering
- U.S. DOE by Iowa State University [DE-AC02-07CH11358]
- U.S. DOE [DE-2009-BNL-PM015]
- Engineering and Physical Sciences Research Council [EP/I031014/1] Funding Source: researchfish
- EPSRC [EP/I031014/1] Funding Source: UKRI
The superconductor iron selenide (FeSe) is of intense interest owing to its unusual nonmagnetic nematic state and potential for high-temperature superconductivity. But its Cooper pairing mechanism has not been determined. We used Bogoliubov quasiparticle interference imaging to determine the Fermi surface geometry of the electronic bands surrounding the Gamma = ( 0, 0) and X = (pi/a(Fe), 0) points of FeSe and to measure the corresponding superconducting energy gaps. We show that both gaps are extremely anisotropic but nodeless and that they exhibit gap maxima oriented orthogonally in momentum space. Moreover, by implementing a novel technique, we demonstrate that these gaps have opposite sign with respect to each other. This complex gap configuration reveals the existence of orbital-selective Cooper pairing that, in FeSe, is based preferentially on electrons from the d(yz) orbitals of the iron atoms.
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