# Is LaO${1-x}$F$x$FeAs an electron-phonon superconductor - Condensed Matter > Superconductivity

Is LaO${1-x}$F$x$FeAs an electron-phonon superconductor - Condensed Matter > Superconductivity - Descarga este documento en PDF. Documentación en PDF para descargar gratis. Disponible también para leer online.

Abstract: In this paper we calculate the electron-phonon coupling of thenewly-discovered superconductor LaO${1-x}$F$x$FeAs from first-principles,using Density Functional Perturbation Theory. For pure LaOFeAs, the calculatedelectron-phonon coupling constant $\lambda=0.21$ and logarithmic-averagedfrequency $\omega {ln}=206 K$, give a maximum $T c$ of 0.8 K, using thestandard Migdal-Eliashberg theory.For the $F-$doped compounds, we predict even smaller coupling constants, dueto the strong suppression of the electronic Density of States at the Fermilevel. To reproduce the experimental $T c=26 K$, a 5-6 times larger couplingconstant would be needed.Our results indicate that electron-phonon coupling is not sufficient toexplain superconductivity in the newly-discovered LaO${1-x}$F$x$FeAssuperconductor, probably due to the importance of strong correlation effects.

Autor: L. Boeri, O. V. Dolgov, A. A. Golubov

Fuente: https://arxiv.org/