2010/04/12 by Lilia Boeri, Matteo Calandra, I. I. Mazin +4 · 8 citations
Business, Management and Accounting · Materials Science · Physics and Astronomy · #Intellectual Capital and Performance Analysis #Iron-based superconductors research #Superconductivity in MgB2 and Alloys #cond-mat.str-el #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevb.82.020506
published as Phys. Rev. B 82, 020506 (2010) · 4 pages, 3 figures
arxiv created 2010/04/12 · openalex publication_date 2010/07/14 · arxiv updated 2010/09/13 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
We calculate the effect of local magnetic moments on the electron-phonon coupling in doped BaFe2As2 using the density-functional perturbation theory. We show that the magnetism enhances the total electron-phonon coupling by \ensuremath∼50%, up to \ensuremathλ\ensuremath\lesssim0.35, 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 not from the phonon softening but 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 \ensuremathλ 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.