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

Chang, M. -H.; Backes, S.; Lu, D.; Gauthier, N.; Hashimoto, M.; Chen, G. -Y.; Wen, H. -H.; Mo, S. -K.; Valentí, R.; Pfau, H.

doi:10.1038/s41467-024-54330-x

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

Journal Article · 17 November 2024 · Nature Communications

DOI: https://doi.org/10.1038/s41467-024-54330-x · OSTI ID:2478043

Chang, M. -H. ^[1];

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^[3]; Chen, G. -Y. ^[5];

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Pennsylvania State Univ., University Park, PA (United States)
RIKEN Center for Emergent Matter Science (CEMS), Wako (Japan)
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States). Stanford Synchrotron Radiation Lightsource (SSRL)
Institut National de la Recherche Scientifique (Canada)
Nanjing Univ. (China)
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
Goethe Univ., Frankfurt (Germany)

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.

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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS); SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE); USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF)

Contributing Organization:: Lawrence Berkeley National Laboratory (LBNL)

Grant/Contract Number:: AC02-05CH11231; AC02-76SF00515; SC0024135

OSTI ID:: 2478043

Journal Information:: Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 15; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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

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