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arxiv: 0908.4364 · v1 · pith:2RX4EMLLnew · submitted 2009-08-29 · ❄️ cond-mat.supr-con · cond-mat.str-el

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 , C. T. Lin This is my paper
classification ❄️ cond-mat.supr-con cond-mat.str-el
keywords superconductingcm-1couplingelectron-phononfe2as2ramanrenormalizationundoped
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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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