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High-energy electronic interaction in the 3 d band of high-temperature iron-based superconductors

DOI: 10.1103/PhysRevB.96.060501 DOI Help

Authors: D. V. Evtushinsky (Institute for Solid State Research, IFW Dresden) , A. N. Yaresko (Max-Planck-Institute for Solid State Research) , V. B. Zabolotnyy (Institute for Solid State Research, IFW Dresden) , J. Maletz (Institute for Solid State Research, IFW Dresden) , T. K. Kim (Diamond Light Source) , A. A. Kordyuk (Institute for Solid State Research, IFW Dresden; Institute of Metal Physics of National Academy of Sciences of Ukraine) , M. S. Viazovska (Humboldt University of Berlin) , M. Roslova (Institute for Solid State Research, IFW Dresden; Moscow State University) , I. Morozov (Institute for Solid State Research, IFW Dresden; Moscow State University) , R. Beck (Institute for Solid State Research, IFW Dresden) , S. Aswartham (Institute for Solid State Research, IFW Dresden) , L. Harnagea (Institute for Solid State Research, IFW Dresden) , S. Wurmehl (Institute for Solid State Research, IFW Dresden; Institut für Festkörperphysik, Technische Universität Dresden) , H. Berger (Moscow State University) , V. A. Rogalev (Swiss Light Source) , V. N. Strocov (Swiss Light Source) , T. Wolf (Karlsruher Institut für Technologie, Institut für Festkörperphysik) , N. D. Zhigadlo (University of Bern; ETH Zurich) , B. Büchner (Institute for Solid State Research, IFW Dresden; Institut für Festkörperphysik, Technische Universität Dresden) , S. V. Borisenko (1Institute for Solid State Research, IFW Dresden)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Physical Review B , VOL 96

State: Published (Approved)
Published: August 2017

Abstract: One of the most unique and robust experimental facts about iron-based superconductors is the renormalization of the electronic band dispersion by factor of 3 and more near the Fermi level. Obviously related to the electron pairing, this prominent deviation from the band theory lacks understanding. Experimentally studying the entire spectrum of the valence electrons in iron arsenides, we have found an unexpected depletion of the spectral weight in the middle of the iron-derived band, which is accompanied by a drastic increase of the scattering rate. At the same time, the measured arsenic-derived band exhibits very good agreement with theoretical calculations. We show that the low-energy Fermi velocity renormalization should be viewed as a part of the modification of the spectral function by a strong electronic interaction. Such an interaction with an energy scale of the whole d band appears to be a hallmark of many families of unconventional superconductors.

Journal Keywords: Fermions; Electronic structure; Energy applications; High-temperature superconductors; Methods in superconductivity; Pnictides; Strongly correlated systems; Superconductivity; Superconductors; Unconventional superconductors; Band structure methods

Subject Areas: Physics, Materials

Facility: BESSY, SLS