Do Transition-Metal Substitutions Dope Carriers in Iron-Based Superconductors?

被引：104

作者：

Berlijn, Tom ^{[1
]}

Lin, Chia-Hui ^{[1
,2
]}

Garber, William ^{[1
]}

Ku, Wei ^{[1
,2
]}

机构：

[1] Brookhaven Natl Lab, Condensed Matter Phys & Mat Sci Dept, Upton, NY 11973 USA

[2] SUNY Stony Brook, Dept Phys & Astron, Stony Brook, NY 11790 USA

来源：

PHYSICAL REVIEW LETTERS | 2012年 / 108卷 / 20期

关键词：

D O I：

10.1103/PhysRevLett.108.207003

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We investigate the currently debated issue concerning whether transition-metal substitutions dope carriers in iron-based superconductors. From first-principles calculations of the configuration-averaged spectral function of BaFe2As2 with disordered Co or Zn substitutions of Fe, important doping effects are found beyond merely changing the carrier density. While the chemical potential shifts suggest doping of a large amount of carriers, a reduction of the coherent carrier density is found due to the loss of spectral weight. Therefore, none of the change in the Fermi surface, density of states, or charge distribution can be solely used for counting doped coherent carriers, let alone presenting the full effects of the disordered substitutions. Our study highlights the necessity of including disorder effects in the studies of doped materials in general.

引用

页数：5

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