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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 BaFe$_{2}$As$_{2}$, and their cousins BaCr$_{2}$As$_{2}$ and BaCo$_{2}$As$_{2}$. 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 K$_{0.4}$Ba$_{0.6}$Fe$_{2}$As$_{2}$ and BaCr$_{2}$As$_{2}$, 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>>k$_{B}$T ), independent of the dopant concentration. The main result is that the slope β = (E>>k$_{B}$T )/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


Verlagsausgabe §
DOI: 10.5445/IR/1000132351
Veröffentlicht am 06.05.2021
Originalveröffentlichung
DOI: 10.1103/PhysRevB.103.155119
Scopus
Zitationen: 9
Web of Science
Zitationen: 9
Dimensions
Zitationen: 13
Cover der Publikation
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
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Web of Science
Scopus
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