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- W588000262 abstract "Establishing the appropriate theoretical framework for unconventional superconductivity in the iron-based materials requires correct understanding of both the electron correlation strength and the role of Fermi surfaces. This fundamental issue becomes especially relevant with the discovery of the iron chalcogenide superconductors. Here, we use angle-resolved photoemission spectroscopy to measure three representative iron chalcogenides, FeTe0.56Se0.44, monolayer FeSe grown on SrTiO3 and K0.76Fe1.72Se2. We show that these superconductors are all strongly correlated, with an orbital-selective strong renormalization in the dxy bands despite having drastically different Fermi surface topologies. Furthermore, raising temperature brings all three compounds from a metallic state to a phase where the dxy orbital loses all spectral weight while other orbitals remain itinerant. These observations establish that iron chalcogenides display universal orbital-selective strong correlations that are insensitive to the Fermi surface topology, and are close to an orbital-selective Mott phase, hence placing strong constraints for theoretical understanding of iron-based superconductors." @default.
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- W588000262 date "2015-07-23" @default.
- W588000262 modified "2023-10-18" @default.
- W588000262 title "Observation of universal strong orbital-dependent correlation effects in iron chalcogenides" @default.
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- W588000262 doi "https://doi.org/10.1038/ncomms8777" @default.
- W588000262 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/4525196" @default.
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