Electronic structure of FeS

Abstract

Here we report the electronic structure of FeS, a recently identified iron-based superconductor. Our high-resolution angle-resolved photoemission spectroscopy studies show two hole-like ($\alpha$ and $\beta$) and two electron-like ($\eta$ and $\delta$) Fermi pockets around the Brillouin zone center and corner, respectively, all of which exhibit moderate dispersion along $k_z$. However, a third hole-like band ($\gamma$) is not observed, which is expected around the zone center from band calculations and is common in iron-based superconductors. Since this band has the highest renormalization factor and is known to be the most vulnerable to defects, its absence in our data is likely due to defect scattering --- and yet superconductivity can exist without coherent quasiparticles in the $\gamma$ band. This may help resolve the current controversy on the superconducting gap structure of FeS. Moreover, by comparing the $\beta$ bandwidths of various iron chalcogenides, including FeS, FeSe${}_{1-x}$S${}_x$, FeSe, and FeSe${}_{1-x}$ Te${}_x$, we find that the $\beta$ bandwidth of FeS is the broadest. However, the band renormalization factor of FeS is still quite large, when compared with the band calculations, which indicates sizable electron correlations. This explains why the unconventional superconductivity can persist over such a broad range of isovalent substitution in FeSe${}_{1-x}$Te${}_x$ and FeSe${}_{1-x}$S${}_x$.

arXiv comment10 pages, 5 figures

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Cited by in corpus (12)

• The key ingredients of the electronic structure of FeSe
• Highly Anisotropic Superconducting Gap in Nematically Ordered and Tetragonal Phases of FeSe${}_{1-x}$S${}_x$
• Suppression of electronic correlations by chemical pressure from FeSe to FeS
• Electronic nematic states tuned by isoelectronic substitution in bulk FeSe1-xSx
• Phonon anomalies in FeS
• Correlation strength, Lifshitz transition and the emergence of a two- to three-dimensional crossover in FeSe under pressure
• Two-dome superconductivity in FeS induced by a Lifshitz transition
• Correlated electronic structure, orbital-dependent correlations, and Lifshitz transition in tetragonal FeS
• Nodal superconductivity coexists with low-moment static magnetism in single-crystalline tetragonal FeS: A muon spin relaxation and rotation study
• Magnetic-Field-Induced Spin Nematicity in FeSe1-xSx and FeSe1-yTey Superconductor Systems
• Thermoelectricity and electronic correlations enhancement in FeS by slight Se substitution
• Accurate determination of the Fermi surface of tetragonal FeS via quantum oscillation measurements and quasiparticle self-consistent \textit{GW} calculations