Self-energy effects and electron-phonon coupling in Fe-As superconductors
K.-Y. Choi, P. Lemmens, I. Eremin, G. Zwicknagl, H. Berger, G. L. Sun,, D. L. Sun, and C. T. Lin
TL;DR
This study uses Raman scattering to investigate electron-phonon interactions and magnetic fluctuations in Fe-As superconductors, revealing temperature-dependent phonon behavior and electronic continuum renormalization related to superconductivity.
Contribution
It provides new insights into the electron-phonon coupling and magnetic fluctuations in Fe-As superconductors through detailed Raman spectroscopy analysis.
Findings
Temperature-dependent phonon frequency and linewidth in superconducting and magnetic phases
Observation of magnetic fluctuations persisting at low temperatures
Electronic continuum renormalization in the superconducting state
Abstract
We report on Raman scattering experiments of the undoped SrFe2As2 and superconducting Sr0.85K0.15Fe2As2 (Tc=28K) and Ba0.72K0.28Fe2As2 (Tc=32K) single crystals. The frequency and linewidth of the B1g mode at 210 cm-1 exhibits an appreciable temperature dependence induced by the superconducting and spin density wave transitions. We give estimates of the electron-phonon coupling related to this renormalization. In addition, we observe a pronounced quasi-elastic Raman response for the undoped compound, suggesting persisting magnetic fluctuations to low temperatures. In the superconducting state the renormalization of an electronic continuum is observed with a threshold energy of 61cm-1.
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