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  6. Dispersion kinks from electronic correlations in an unconventional iron-based superconductor
 
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Title(s)
TitleLanguage
Dispersion kinks from electronic correlations in an unconventional iron-based superconductor
en
 
Author(s)
NameORCIDGNDAffiliation
Chang, Ming-Hua
Pennsylvania State University 
Backes, Steffen
0000-0002-7761-7098
RIKEN, Wako, Japan 
Lu, Donghui
0000-0002-9708-0443
SLAC National Accelerator Laboratory, Menlo Park, CA 
Gauthier, Nicolas
0000-0001-6147-243X
Institut National de la Recherche Scientifique, Quebec 
Hashimoto, Makoto
SLAC National Accelerator Laboratory, Menlo Park, CA 
Chen, Guan-Yu
Nanjing University 
Wen, Hai-Hu
0000-0003-0093-1625
Nanjing University 
Mo, Sung-Kwan
0000-0003-0711-8514
Lawrence Berkeley National Laboratory 
Valentí, Roser
0000-0003-0497-1165
Theoretical Physics 
Pfau, Heike
Pennsylvania State University 
 
Faculty
13 Physics
 
Date Issued
17 November 2024
 
Publisher(s)
Goethe-Universität Frankfurt
 
Handle
https://gude.uni-frankfurt.de/handle/gude/682
 
DOI
10.1038/s41467-024-54330-x
 

Type(s) of data
Dataset
 
Language(s)
en
 
Abstract(s)
AbstractLanguage
The attractive interaction in conventional BCS superconductors is provided by a bosonic mode. However, the pairing glue of most unconventional superconductors is unknown. The effect of electron-boson coupling is therefore extensively studied in these materials. A key signature is dispersion kinks that can be observed in the spectral function as abrupt changes in velocity and lifetime of quasiparticles. Here, we show the existence of two kinks in the unconventional iron-based superconductor RbFe2As2 using angle-resolved photoemission spectroscopy (ARPES) and dynamical mean field theory (DMFT). In addition, we observe the formation of a Hubbard band multiplet due to the combination of Coulomb interaction and Hund’s rule coupling in this multiorbital system. We demonstrate that the two dispersion kinks are a consequence of these strong many-body interactions. This interpretation is in line with a growing number of theoretical predictions for kinks in various general models of correlated materials. Our results provide a unifying link between iron-based superconductors and different classes of correlated, unconventional superconductors such as cuprates and heavy-fermion materials.
en
 
Description(s)
DescriptionLanguage
Data sets for the figures in the main text of the paper(Nat. Commun. 15, 9958 (2024))
en
 

License
All rights reserved
 

Views
5
Acquisition Date
Oct 21, 2025
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