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Observation of universal strong orbital-dependent correlation effects in iron chalcogenides
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Observation of universal strong orbital-dependent correlation effects in iron chalcogenides
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Journal Article
Observation of universal strong orbital-dependent correlation effects in iron chalcogenides
2015
Overview
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, FeTe
0.56
Se
0.44
, monolayer FeSe grown on SrTiO
3
and K
0.76
Fe
1.72
Se
2
. We show that these superconductors are all strongly correlated, with an orbital-selective strong renormalization in the
d
xy
bands despite having drastically different Fermi surface topologies. Furthermore, raising temperature brings all three compounds from a metallic state to a phase where the
d
xy
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.
A proper theoretical description for unconventional superconductivity in iron-based compounds remains elusive. Here, the authors, to capture the electron correlation strength and the role of Fermi surfaces, report ARPES measurements of three iron chalcogenide superconductors to establish universal features.
Publisher
Nature Publishing Group UK,Nature Publishing Group,Nature Pub. Group
