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)

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