Nematic Resonance in the Raman Response of Iron-Based Superconductors

Physical Review Letters
Yann GallaisJörg Schmalian

Abstract

In a fully gapped superconductor the electronic Raman response has a pair-breaking peak at twice the superconducting gap Δ, if the Bogoliubov excitations are uncorrelated. Motivated by the iron based superconductors, we study how this peak is modified if the superconducting phase hosts a nematic-structural quantum critical point. We show that, upon approaching this point by tuning, e.g., doping, the growth of nematic correlations between the quasiparticles transforms the pair-breaking peak into a nematic resonance. The mode energy is below 2Δ, and stays finite at the quantum critical point, where its spectral weight is sharply enhanced. The latter is consistent with recent experiments on electron-doped iron based superconductors and provides direct evidence of nematic correlations in their superconducting phases.

References

Apr 28, 2009·Physical Review Letters·M D LumsdenD Mandrus
Jan 15, 2011·Physical Review Letters·R M FernandesJ Schmalian
Aug 11, 2012·Science·Jiun-Haw ChuIan R Fisher
Aug 21, 2013·Physical Review Letters·Rafael M FernandesAndrey V Chubukov
Feb 4, 2014·Physical Review Letters·Y GallaisA Forget

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Citations

Aug 3, 2016·Proceedings of the National Academy of Sciences of the United States of America·Pierre MassatYann Gallais
Apr 10, 2020·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Nenad Lazarevic, Rudi U Hackl
Dec 5, 2020·Physical Review Letters·G HeR Hackl
May 14, 2021·Proceedings of the National Academy of Sciences of the United States of America·Weilu ZhangGirsh Blumberg

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