@article{15512d6ecc414a63ae8314ab02d9a439,
title = "High- Tc superconductivity in CaKFe4As4 in absence of nematic fluctuations",
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.",
author = "Zhang, {W. L.} and Meier, {W. R.} and T. Kong and Canfield, {P. C.} and G. Blumberg",
note = "Funding Information: The spectroscopic work at Rutgers (W.Z. and G.B.) was supported by NSF Grant No. DMR-1709161. Crystal growth and characterization at Ames Laboratory (T.K. and P.C.C.) was supported by the U.S. Department of Energy, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering under Contract No. DE-AC02-07CH11358. W.R.M. (crystal growth) was supported by the Gordon and Betty Moore Foundation's EPiQS Initiative through Grant No. GBMF4411. Funding Information: Acknowledgments. The spectroscopic work at Rutgers (W.Z. and G.B.) was supported by NSF Grant No. DMR-1709161. Crystal growth and characterization at Ames Laboratory (T.K. and P.C.C.) was supported by the U.S. Department of Energy, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering under Contract No. DE-AC02-07CH11358. W.R.M. (crystal growth) was supported by the Gordon and Betty Moore Foundation{\textquoteright}s EPiQS Initiative through Grant No. GBMF4411. Publisher Copyright: {\textcopyright} 2018 American Physical Society.",
year = "2018",
month = oct,
day = "10",
doi = "10.1103/PhysRevB.98.140501",
language = "English (US)",
volume = "98",
journal = "Physical Review B-Condensed Matter",
issn = "0163-1829",
publisher = "American Physical Society",
number = "14",
}