Is LaFeAsO1-xFx an electron-phonon superconductor?

被引：539

作者：

Boeri, L. ^{[1
]}

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

Golubov, A. A. ^{[2
,3
]}

机构：

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

[2] Univ Twente, Fac Sci & Technol, NL-7500 AE Enschede, Netherlands

[3] Univ Twente, MESA Inst Nanotechnol, NL-7500 AE Enschede, Netherlands

来源：

PHYSICAL REVIEW LETTERS | 2008年 / 101卷 / 02期

关键词：

D O I：

10.1103/PhysRevLett.101.026403

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

In this Letter, we calculate the electron-phonon coupling of the newly discovered superconductor LaFeAsO1-xFx using linear response. For pure LaFeAsO, the calculated electron-phonon coupling constant lambda=0.21 and logarithmic-averaged frequency omega(ln)=206 K give a maximum T-c of 0.8 K, using the standard Migdal-Eliashberg theory. For the F-doped compounds, we predict even smaller coupling constants. To reproduce the experimental T-c, a 5-6 times larger coupling constant would be needed. Our results indicate that electron-phonon coupling is not sufficient to explain superconductivity in the whole family of Fe-As-based superconductors, probably due to the importance of strong-correlation effects.

引用

页数：4

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