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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 ©2008 The American Physical Society REFERENCES (23)
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S. Baroni et al., Rev. Mod. Phys. 73, 515 (2001). J. M. An and W. E. Pickett, Phys. Rev. Lett. 86, 4366 (2001); A. Floris et al., Phys. Rev. Lett. 94, 037004 (2005). CITING ARTICLESFor access to citing articles, you need to log in.
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=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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