Effects of magnetism and doping on the electron-phonon coupling in BaFe2As2

被引：111

作者：

Boeri, L. ^{[1
]}

Calandra, M. ^{[2
]}

Mazin, I. I. ^{[3
]}

Dolgov, O. V. ^{[1
]}

Mauri, F. ^{[2
]}

机构：

[1] Max Planck Inst Festkorperforsch, D-70569 Stuttgart, Germany

[2] CNRS, Inst Mineral & Phys Milieux Condenses, F-75252 Paris 05, France

[3] USN, Res Lab, Washington, DC 20375 USA

来源：

PHYSICAL REVIEW B | 2010年 / 82卷 / 02期

关键词：

D O I：

10.1103/PhysRevB.82.020506

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

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 similar to 50%, up to lambda <= 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 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 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.

引用

页数：4

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