High- Tc superconductivity in CaKFe4As4 in absence of nematic fluctuations

W. L. Zhang, W. R. Meier, T. Kong, P. C. Canfield, Girsh Blumberg

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

We employ polarization-resolved Raman spectroscopy to study the multiband stoichiometric Tc=35 K superconductor CaKFe4As4. We do not detect Pomeranchuk-like electronic nematic fluctuations which were universally observed in the XY(B2g) 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 λΓ=0.0015 which is insufficient to provide attraction for high-Tc pairing.

Original languageEnglish (US)
Article number140501
JournalPhysical Review B
Volume98
Issue number14
DOIs
StatePublished - Oct 10 2018

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Superconductivity
Superconducting materials
Raman spectroscopy
superconductivity
Polarization
Electrons
Composite materials
attraction
energy
retarding
composite materials
symmetry
polarization
electronics
Iron-based Superconductors
electrons

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Zhang, W. L. ; Meier, W. R. ; Kong, T. ; Canfield, P. C. ; Blumberg, Girsh. / High- Tc superconductivity in CaKFe4As4 in absence of nematic fluctuations. In: Physical Review B. 2018 ; Vol. 98, No. 14.
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High- Tc superconductivity in CaKFe4As4 in absence of nematic fluctuations. / Zhang, W. L.; Meier, W. R.; Kong, T.; Canfield, P. C.; Blumberg, Girsh.

In: Physical Review B, Vol. 98, No. 14, 140501, 10.10.2018.

Research output: Contribution to journalArticle

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