Publication Date
10-10-2018
Department
Ames Laboratory; Materials Science and Engineering; Physics and Astronomy
Campus Units
Ames Laboratory, Materials Science and Engineering, Physics and Astronomy
OSTI ID+
1478235
Report Number
IS-J 9774
DOI
10.1103/PhysRevB.98.140501
Journal Title
Physical Review B
Volume Number
98
Issue Number
14
First Page
140501
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.
DOE Contract Number(s)
DMR-1709161; AC02-07CH11358; GBMF4411
Language
en
Department of Energy Subject Categories
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Publisher
Iowa State University Digital Repository, Ames IA (United States)
