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.

12 pages, 9 figures

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Cited by in corpus (17)

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• Nematicity, magnetism and superconductivity in FeSe
• Suppression of electronic correlations by chemical pressure from FeSe to FeS
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• Protonation-induced discrete superconducting phases in bulk FeSe single crystals
• Tuning electronic correlations in transition metal pnictides: chemistry beyond the valence count
• Quantum phase transition of correlated iron-based superconductivity in LiFe${}_{1-x}$Co${}_x$As
• Intra-layer doping effects on the high-energy magnetic correlations in NaFeAs
• Correlation-induced self-doping in intercalated iron-pnictide superconductor Ba2Ti2Fe2As4O
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• Magnetic-Field-Induced Spin Nematicity in FeSe1-xSx and FeSe1-yTey Superconductor Systems
• The weak electronic correlations and absence of heavy Fermion state in KNi${}_2$Se${}_2$
• Drastic electronic structure reconstruction of Ca${}_{1-x}$Pr${}_x$Fe${}_2$As${}_2$ in the collapsed tetragonal phase
• Effect of electron doping in FeTe${}_{1-y}$Se${}_y$ realized by Co and Ni substitution
• Orbital-selective Mott phase of Cu-substituted iron-based Superconductors
• Fluctuating magnetism of Co- and Cu-doped NaFeAs