Quantum critical fluctuations in an Fe-based superconductor

Jost, Daniel; Peis, Leander; He, Ge; Baum, Andreas; Geprägs, Stephan; Palmstrom, Johanna C.; Ikeda, Matthias S.; Fisher, Ian R.; Wolf, Thomas; Lederer, Samuel; Kivelson, Steven A.; Hackl, Rudi

doi:10.1038/s42005-022-00981-5

Title: Quantum critical fluctuations in an Fe-based superconductor

Journal Article · 08 August 2022 · Communications Physics

DOI: https://doi.org/10.1038/s42005-022-00981-5 · OSTI ID:1880390

; Peis, Leander; He, Ge; Baum, Andreas; Geprägs, Stephan;

; Ikeda, Matthias S.;

; Wolf, Thomas; Lederer, Samuel; Kivelson, Steven A.;

Abstract Quantum critical fluctuations may prove to play an instrumental role in the formation of unconventional superconductivity. Here, we show that the characteristic scaling of a marginal Fermi liquid is present in inelastic light scattering data of an Fe-based superconductor tuned through a quantum critical point (QCP) by chemical substitution or doping. From the doping dependence of the imaginary time dynamics we are able to distinguish regions dominated by quantum critical behavior from those having classical critical responses. This dichotomy reveals a connection between the marginal Fermi liquid behavior and quantum criticality. In particular, the overlap between regions of high superconducting transition temperatures and quantum critical scaling suggests a contribution from quantum fluctuations to the formation of superconductivity.

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Research Organization:: SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)

Sponsoring Organization:: Alexander-von-Humboldt foundation; Bavaria-California Technology Center; Friedrich-Ebert foundation; German Research Foundation (DFG); USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division

Grant/Contract Number:: AC02-76SF00515

OSTI ID:: 1880390

Journal Information:: Communications Physics, Journal Name: Communications Physics Journal Issue: 1 Vol. 5; ISSN 2399-3650

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United Kingdom

Language:: English

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