Is LaFeAsO1_xFx an Electron-Phonon Superconductor?

L. Boeri, O.V. Dolgov, Alexandre Avraamovitch Golubov

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534 Citations (Scopus)

Abstract

In this Letter, we calculate the electron-phonon coupling of the newly discovered superconductor LaFeAsO1xFx using linear response. For pure LaFeAsO, the calculated electron-phonon coupling constant 0:21 and logarithmic-averaged frequency !ln 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.
Original languageUndefined
Pages (from-to)026403-
JournalPhysical review letters
Volume101
Issue number2
DOIs
Publication statusPublished - 2008

Keywords

  • METIS-252530
  • IR-59244

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