Is LaFeAsO1-xFx an Electron-Phonon Superconductor?


Boeri, L. and Dolgov, O.V. and Golubov, A.A. (2008) Is LaFeAsO1-xFx an Electron-Phonon Superconductor? Physical Review Letters, 101 (2). 026403. ISSN 0031-9007

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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.
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Copyright:© 2008 American Physical Society
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