Effects of magnetism and doping on the electron-phonon coupling in BaFe${}_2$As${}_2$

Abstract

We calculate the effect of local magnetic moments on the electron-phonon coupling in BaFe${}_2$As${}_2+\delta$ using the density functional perturbation theory. We show that the magnetism enhances the total electron-phonon coupling by $\sim 50$, up to $\lambda \lesssim 0.35$, still not enough to explain the high critical temperature, but strong enough to have a non-negligible effect on superconductivity, for instance, by frustrating the coupling with spin fluctuations and inducing order parameter nodes. The enhancement comes mostly from a renormalization of the electron-phonon matrix elements. We also investigate, in the rigid band approximation, the effect of doping, and find that $\lambda$ versus doping does not mirror the behavior of the density of states; while the latter decreases upon electron doping, the former does not, and even increases slightly.

4 pages, 3 figures

References in corpus (10)

• Unconventional pairing originating from disconnected Fermi surfaces in superconducting LaFeAsO${}_{1-x}$F${}_x$}
• Spin density wave anomaly at 140 K in the ternary iron arsenide BaFe2As2
• Is LaO${}_{1-x}$F${}_x$FeAs an electron-phonon superconductor ?
• Electronic Structure and Doping in BaFe${}_2$As${}_2$ and LiFeAs: Density Functional Calculations
• The challenge of unravelling magnetic properties in LaFeAsO
• The Unprecedented Giant Coupling of Fe-spin State and the As-As Hybridization in Iron-Pnictide
• Dichotomy between large local and small ordered magnetic moment in Iron-based superconductors
• Phonon anomalies in pure and underdoped R{1-x}K{x}Fe{2}As{2} (R = Ba, Sr) investigated by Raman light scattering
• Ab initio lattice dynamics simulations and inelastic neutron scattering spectra for studying phonons in BaFe2As2: Effect of structural phase transition, structural relaxation and magnetic ordering
• Anomalous electron-phonon interaction in doped LaOFeAs: a First Principles calculation

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