Origin of the Spin Density Wave Instability in AFe2As2 (A=Ba,Sr) as Revealed by Optical Spectroscopy

被引：252

作者：

Hu, W. Z. ^{[1
]}

Dong, J. ^{[1
]}

Li, G. ^{[1
]}

Li, Z. ^{[1
]}

Zheng, P. ^{[1
]}

Chen, G. F. ^{[1
]}

Luo, J. L. ^{[1
]}

Wang, N. L. ^{[1
]}

机构：

[1] Chinese Acad Sci, Inst Phys, Beijing Natl Lab Condensed Matter Phys, Beijing 100190, Peoples R China

来源：

PHYSICAL REVIEW LETTERS | 2008年 / 101卷 / 25期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1103/PhysRevLett.101.257005

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We performed optical spectroscopy measurement on single crystals of BaFe2As2 and SrFe2As2, the parent compounds of FeAs-based superconductors. Both are found to be quite metallic with fairly large plasma frequencies at high temperature. Upon entering the spin-density-wave state, the formation of partial energy gaps was clearly observed with the surprising presence of two different energy scales. A large part of the Drude component was removed by the gapping of Fermi surfaces. Meanwhile, the carrier scattering rate was even more dramatically reduced. We elaborate that the spin-density-wave instability is more likely to be driven by the Fermi surface nesting of itinerant electrons than a local-exchange mechanism.

引用

页数：4

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