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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., et al. (2021). Linkage between scattering rates and superconductivity in doped ferropnictides. Physical Review B, 103(15): 155119, pp. 1-8. doi:10.1103/PhysRevB.103.155119.

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 Creators:
Fink, J.1, Author              
Rienks, E. D. L.2, Author
Yao, M.1, Author              
Kurleto, R.2, Author
Bannies, J.1, Author              
Aswartham, S.2, Author
Morozov, I.2, Author
Wurmehl, S.2, Author
Wolf, T.2, Author
Hardy, F.2, Author
Meingast, C.2, Author
Jeevan, H. S.2, Author
Maiwald, J.2, Author
Gegenwart, P.2, Author
Felser, C.3, Author              
Büchner, B.2, Author
Affiliations:
1Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863425              
2External Organizations, ou_persistent22              
3Claudia Felser, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863429              

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Free keywords: Arsenic compounds, Barium compounds, Carrier mobility, Chromium compounds, Cobalt compounds, Iron compounds, Potassium compounds, Semiconductor doping, Spin fluctuations, Superconducting transition temperature, Angle-resolved photoemission, Dependent scatterings, Dopant concentrations, Energy dependence, Fluctuation model, Parent compounds, Scattering rates, Superconducting state, Iron-based Superconductors
 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 Γ(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 Imς(E). We obtain a non-Fermi liquidlike linear in energy scattering rate Γ(E≫kBT), independent of the dopant concentration. The main result is that the slope β=Γ(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 Γ(E)/E≈1. This result, together with the energy dependence of the renormalization function Z(E), signals very incoherent charge carriers in the normal state which transform at low temperatures to a coherent unconventional superconducting state. © 2021 authors.

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Language(s): eng - English
 Dates: 2021-04-122021-04-12
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.1103/PhysRevB.103.155119
 Degree: -

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Title: Physical Review B
  Abbreviation : Phys. Rev. B
Source Genre: Journal
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Publ. Info: Woodbury, NY : American Physical Society
Pages: - Volume / Issue: 103 (15) Sequence Number: 155119 Start / End Page: 1 - 8 Identifier: ISSN: 1098-0121
CoNE: https://pure.mpg.de/cone/journals/resource/954925225008