Effects of Magnetism and Doping on the Electron-Phonon Coupling in BaFe2As2
Abstract
We calculate the effect of local magnetic moments on the electron-phonon coupling in BaFe2As2+ using the density functional perturbation theory. We show that the magnetism enhances the total electron-phonon coupling by approximately 50%, up to lambda smaller or approximate to 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.
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 12, 2010
- Accession Number
- ADA518640
Entities
People
- F. Mauri
- I. I. Mazin
- L. Boeri
- M. Calandra
- O. V. Dolgov
Organizations
- United States Naval Research Laboratory