Experimental evidence for importance of Hund's exchange interaction for incoherence of charge carriers in iron-based superconductors
Fink J, Rienks EDL, Thirupathaiah S, Nayak J, Van Roekeghem A, Biermann S, Wolf T, Adelmann P, Jeevan HS, Gegenwart P, Wurmehl S, Felser C, Buechner B (2017)
Publication Type: Journal article
Publication year: 2017
Journal
Book Volume: 95
Article Number: 144513
Journal Issue: 14
DOI: 10.1103/PhysRevB.95.144513
Abstract
Angle-resolved photoemission spectroscopy is used to study the scattering rates of charge carriers from the hole pockets near Γ in the iron-based high-Tc hole-doped superconductors KxBa1-xFe2As2, x=0.4, and KxEu1-xFe2As2, x=0.55, and the electron-doped compound Ba(Fe1-xCox)2As2, x=0.075. The scattering rate for any given band is found to depend linearly on the energy, indicating a non-Fermi-liquid regime. The scattering rates in the hole-doped compound are considerably higher than those in the electron-doped compounds. In the hole-doped systems the scattering rate of the charge carriers of the inner hole pocket is about three times higher than the binding energy, indicating that the spectral weight is heavily incoherent. The strength of the scattering rates and the difference between electron- and hole-doped compounds signals the importance of Hund's exchange coupling for correlation effects in these iron-based high-Tc superconductors. The experimental results are in qualitative agreement with theoretical calculations in the framework of combined density functional dynamical mean-field theory.
Involved external institutions
École Polytechnique - Université Paris-Saclay
France (FR)
Universität Augsburg
Germany (DE)
Leibniz-Institut für Festkörper- und Werkstoffforschung Dresden e.V. (IFW) / Leibniz Institute for Solid State and Materials Research Dresden
Germany (DE)
Karlsruhe Institute of Technology (KIT)
Germany (DE)
French Alternative Energies and Atomic Energy Commission (CEA)
France (FR)
Indian Institute of Science (IISc)
India (IN)
Max-Planck-Institut für Chemische Physik fester Stoffe (MPI CPfS) / Max Planck Institute for Chemical Physics of Solids
Germany (DE)
France (FR)
Universität Augsburg
Germany (DE)
Leibniz-Institut für Festkörper- und Werkstoffforschung Dresden e.V. (IFW) / Leibniz Institute for Solid State and Materials Research Dresden
Germany (DE)
Karlsruhe Institute of Technology (KIT)
Germany (DE)
French Alternative Energies and Atomic Energy Commission (CEA)
France (FR)
Indian Institute of Science (IISc)
India (IN)
Max-Planck-Institut für Chemische Physik fester Stoffe (MPI CPfS) / Max Planck Institute for Chemical Physics of Solids
Germany (DE)
How to cite
APA:
Fink, J., Rienks, E.D.L., Thirupathaiah, S., Nayak, J., Van Roekeghem, A., Biermann, S.,... Buechner, B. (2017). Experimental evidence for importance of Hund's exchange interaction for incoherence of charge carriers in iron-based superconductors. Physical Review B, 95(14). https://dx.doi.org/10.1103/PhysRevB.95.144513
MLA:
Fink, J., et al. "Experimental evidence for importance of Hund's exchange interaction for incoherence of charge carriers in iron-based superconductors." Physical Review B 95.14 (2017).
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