Phys. Rev. Lett. 101, 026403 (2008) [4 pages]Is LaFeAsO1-xFx an Electron-Phonon Superconductor?Received 18 March 2008; published 8 July 2008 In this Letter, we calculate the electron-phonon coupling of the newly discovered superconductor LaFeAsO1-xFx using linear response. For pure LaFeAsO, the calculated electron-phonon coupling constant λ=0.21 and logarithmic-averaged frequency ωln=206 K give a maximum Tc of 0.8 K, using the standard Migdal-Eliashberg theory. For the F-doped compounds, we predict even smaller coupling constants. To reproduce the experimental Tc, a 5–6 times larger coupling constant would be needed. Our results indicate that electron-phonon coupling is not sufficient to explain superconductivity in the whole family of Fe-As-based superconductors, probably due to the importance of strong-correlation effects. © 2008 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.101.026403
DOI:
10.1103/PhysRevLett.101.026403
PACS:
71.38.−k, 74.25.Jb, 74.25.Kc, 74.70.Dd
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