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Linkage between scattering rates and superconductivity in doped ferropnictides

Fink, J.; Rienks, E. D. L.; Yao, M.; Kurleto, R.; Bannies, J.; Aswartham, S.; Morozov, I.; Wurmehl, S.; Wolf, T. 1; Hardy, F. 1; Meingast, C. 1; Jeevan, H. S.; Maiwald, J.; Gegenwart, P.; Felser, C.; Büchner, B.
1 Institut für QuantenMaterialien und Technologien (IQMT), Karlsruher Institut für Technologie (KIT)

Abstract:

We report an angle-resolved photoemission study of a series of hole- and electron-doped iron-based superconductors, their parent compound BaFe2As2, and their cousins BaCr2As2 and BaCo2As2. We focus on the inner hole pocket, which is the hot spot in these compounds. More specifically, we determine the energy (E)-dependent scattering rate (E) as a function of the 3d count. Moreover, for the compounds K0.4Ba0.6Fe2As2 and BaCr2As2, we derive the energy dependence of the renormalization function Z(E) and the imaginary part of the self-energy function Im(E). We obtain a non-Fermi liquidlike linear in energy scattering rate (E>>kBT ), independent of the dopant concentration. The main result is that the slope β = (E>>kBT )/E reaches its maxima near optimal doping and scales with the superconducting transition temperature. This supports the spin fluctuation model for superconductivity for these materials. In the optimally hole-doped compound, the slope of the scattering rate of the inner hole pocket is about three times bigger than the Planckian limit T(E)/E ≈ 1. ... mehr

Zugehörige Institution(en) am KIT Institut für QuantenMaterialien und Technologien (IQMT)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2021
Sprache Englisch
Identifikator ISSN: 2469-9950
KITopen-ID: 1000132351
HGF-Programm 47.11.02 (POF IV, LK 01) Emergent Quantum Phenomena
Erschienen in Physical Review B
Band 103
Heft 15
Seiten Art.:-Nr.: 155119
Vorab online veröffentlicht am 12.04.2021
Nachgewiesen in Web of Science
Dimensions
Scopus

Verlagsausgabe §
DOI: 10.5445/IR/1000132351
Veröffentlicht am 06.05.2021
Originalveröffentlichung
DOI: 10.1103/PhysRevB.103.155119
Scopus
Zitationen: 10
Web of Science
Zitationen: 9
Dimensions
Zitationen: 14
Seitenaufrufe: 106
seit 07.05.2021
Downloads: 77
seit 07.05.2021
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