Self-energy effects and electron-phonon coupling in Fe-As superconductors

Details Self-energy effects and electron-phonon coupling in Fe-As superconductors Self-energy effects and electron-phonon coupling in Fe-As superconductors

2009-08-29

arxiv.org/abs/0908.4364v1

J. Phys.: Condens. Matter 22, 115802 (2010)

Physics

Condensed Matter

Superconductivity

6 pages, 5 figures

Scientific paper

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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