Strong electron-phonon coupling of the Fe breathing mode of LaO_{1-x}F_xFeAs

Abstract

The electron-phonon coupling of LaO${}_{1-x}$F${}_x$FeAs is re-investigated on the basis of density functional theory in local density approximation. The implications of the $(\pi ,\pi )$ nesting of the Fermi surfaces are carefully studied and found to lead to a non-standard electron-phonon coupling of the corresponding Fe in-plane breathing mode, which might make a strong contribution to the high superconducting transition temperature. The semi-metallic behavior of the undoped material is also further illuminated.

arXiv comment4 pages, 8figures, submitted to PRL (This manuscript replaces an earlier version which, unfortunately, contained an erroneous passage.)

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