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High-T-c superconductivity in CaKFe4As4 in absence of nematic fluctuations

TitleHigh-T-c superconductivity in CaKFe4As4 in absence of nematic fluctuations
Publication TypeJournal Article
Year of Publication2018
AuthorsZhang, WL, Meier, WR, Kong, T, Canfield, PC, Blumberg, G
JournalPhysical Review B
Date Published10
Type of ArticleArticle
ISBN Number2469-9950
Accession NumberWOS:000446905200001
Keywordselectrons, fe-based superconductors, gap, iron-based superconductors, pairing mechanism, phonons, physics, raman-scattering, rb, temperature-dependence, yba2cu3o7-delta

We employ polarization-resolved Raman spectroscopy to study the multiband stoichiometric T-c= 35 K superconductor CaKFe4As4. We do not detect Pomeranchuk-like electronic nematic fluctuations which were universally observed in the XY (B-2g) symmetry Raman response for most families of the Fe-based superconductors. In the superconducting state we observe, consistent with a nodeless order parameter, a full spectral weight suppression at low energies and the emergence of a composite pair-breaking coherence feature at energies between 12 and 20 meV. We analyze the superconductivity-induced phonon self-energy effects and give an estimation for the electron-phonon coupling constant lambda(Gamma) = 0.0015 which is insufficient to provide attraction for high-T-c pairing.

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Complex States

Alternate JournalPhys. Rev. B