Dispersion kinks from electronic correlations in an unconventional iron-based superconductor.

ABSTRACT: 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 demonstra

SUBMITTER: Chang MH 

PROVIDER: S-EPMC11570641 | biostudies-literature | 2024 Nov

REPOSITORIES: biostudies-literature