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

doi:10.1088/0953-8984/22/11/115802

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

Superconductivity 2015-05-14 v1 Strongly Correlated Electrons

Authors: K. -Y. Choi , P. Lemmens , I. Eremin , G. Zwicknagl , H. Berger , G. L. Sun , D. L. Sun , C. T. Lin

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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.

Keywords

raman scattering electron-phonon coupling self-energy effects iron-arsenide superconductors spin density wave superconducting gap

Cite

@article{arxiv.0908.4364,
  title  = {Self-energy effects and electron-phonon coupling in Fe-As superconductors},
  author = {K. -Y. Choi and P. Lemmens and I. Eremin and G. Zwicknagl and H. Berger and G. L. Sun and D. L. Sun and C. T. Lin},
  journal= {arXiv preprint arXiv:0908.4364},
  year   = {2015}
}

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6 pages, 5 figures

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

Abstract

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