Is LaO$_{1-x}$F$_x$FeAs an electron-phonon superconductor ?

Details Is LaO$_{1-x}$F$_x$FeAs an electron-phonon superconductor ? Is LaO$_{1-x}$F$_x$FeAs an electron-phonon superconductor ?

2008-03-18

arxiv.org/abs/0803.2703v1

Physical Review Letters, 101, 026403 (2008)

Physics

Condensed Matter

Superconductivity

Scientific paper

10.1103/PhysRevLett.101.026403

In this paper we calculate the electron-phonon coupling of the newly-discovered superconductor LaO$_{1-x}$F$_x$FeAs from first-principles, using Density Functional Perturbation Theory. For pure LaOFeAs, the calculated electron-phonon coupling constant $\lambda=0.21$ and logarithmic-averaged frequency $\omega_{ln}=206 K$, give a maximum $T_c$ of 0.8 K, using the standard Migdal-Eliashberg theory. For the $F-$doped compounds, we predict even smaller coupling constants, due to the strong suppression of the electronic Density of States at the Fermi level. To reproduce the experimental $T_c=26 K$, 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 newly-discovered LaO$_{1-x}$F$_x$FeAs superconductor, probably due to the importance of strong correlation effects.

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