Electron-phonon properties of pnictide superconductors

被引：36

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, Inst Nanotechnol, MESA, NL-7500 AE Enschede, Netherlands

来源：

PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS | 2009年 / 469卷 / 9-12期

关键词：

Electron-phonon interactions; Superconductors phonons; Superconductors electronic structure; Iron pnictides; LAYERED SUPERCONDUCTOR; BAND; TEMPERATURE;

D O I：

10.1016/j.physc.2009.03.020

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

In this paper we discuss the normal and superconducting state properties of two pnictide superconductors, LaOFeAs and LaONiAs, using Migdal-Eliashberg theory and density functional perturbation theory. For pure LaOFeAs, the calculated electron-phonon coupling constant lambda = 0.21 and logarithmic-averaged frequency omega(tn) = 206 K, give a maximum T-c of 0.8 K, using the standard Migdal-Eliashberg theory. inclusion of multi-band effects increases the T-c only marginally. To reproduce the experimental T-c a 5-6 times larger coupling constant would be needed. Our results indicate that standard electron-phonon coupling is not sufficient to explain superconductivity in the whole family of Fe-As based superconductors. At the same time, the electron-phonon coupling in Ni-As based compounds is much stronger and its normal and superconducting state properties can be well described by standard Migdal-Eliashberg theory. (C) 2009 Elsevier B.V. All rights reserved.

引用

页码：628 / 634

页数：7

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