Extraordinary quasiparticle scattering and bandwidth-control by dopants in iron-based superconductors

Abstract

The diversities in crystal structures and ways of doping result in extremely diversified phase diagrams for iron-based superconductors. With angle-resolved photoemission spectroscopy (ARPES), we have systematically studied the effects of chemical substitution on the electronic structure of various series of iron-based superconductors. In addition to the control of Fermi surface topology by heterovalent doping, we found two more extraordinary effects of doping: 1. the site and band dependencies of quasiparticle scattering; and more importantly 2. the ubiquitous and significant bandwidth-control by both isovalent and heterovalent dopants in the iron-anion layer. Moreover, we found that the bandwidth-control could be achieved by either applying the chemical pressure or doping electrons, but not by doping holes. Together with other findings provided here, these results complete the microscopic picture of the electronic effects of dopants, which facilitates a unified understanding of the diversified phase diagrams and resolutions to many open issues of various iron-based superconductors.

arXiv comment12 pages, 9 figures

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Cited by in corpus (47)

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• Nematicity, magnetism and superconductivity in FeSe
• Orbital selective pairing and gap structures of iron-based superconductors
• Surface electronic structure and isotropic superconducting gap in (Li${}_{0.8}$Fe${}_{0.2}$)OHFeSe
• Suppression of electronic correlations by chemical pressure from FeSe to FeS
• Unified phase diagram for iron-based superconductors
• Orbital-differentiated coherence-incoherence crossover identified by photoemission spectroscopy in LiFeAs
• Charge transfer and electron-phonon coupling in monolayer FeSe on Nb doped SrTiO${}_3$
• Orbital selective spin excitations and their impact on superconductivity of LiFe1-xCoxAs
• Identification of prototypical Brinkman-Rice Mott physics in a class of iron chalcogenides superconductors
• Non-Fermi-liquid scattering rates and anomalous band dispersion in ferropnictides
• Protonation-induced discrete superconducting phases in bulk FeSe single crystals
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