Anisotropy of the In-Plane Resistivity of Underdoped Ba(Fe1-xCox)2As2 Superconductors Induced by Impurity Scattering in the Antiferromagnetic Orthorhombic Phase

被引：88

作者：

Ishida, S. ^{[1
,2
,3
]}

Nakajima, M. ^{[1
,2
,3
]}

Liang, T. ^{[1
,2
,3
]}

Kihou, K. ^{[2
,3
]}

Lee, C. H. ^{[2
,3
]}

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

Eisaki, H. ^{[2
,3
]}

Kakeshita, T. ^{[1
,3
]}

Tomioka, Y. ^{[2
,3
]}

Ito, T. ^{[2
,3
]}

Uchida, S. ^{[1
,3
]}

机构：

[1] Univ Tokyo, Dept Phys, Tokyo 1130033, Japan

[2] Natl Inst Adv Ind Sci & Technol, Tsukuba, Ibaraki 3058568, Japan

[3] JST, Transformat Res Project Iron Pnictides, Tokyo 1020075, Japan

来源：

PHYSICAL REVIEW LETTERS | 2013年 / 110卷 / 20期

基金：

日本科学技术振兴机构; 日本学术振兴会;

关键词：

TRANSITION; STATE;

D O I：

10.1103/PhysRevLett.110.207001

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We investigated the in-plane resistivity anisotropy for underdoped Ba(Fe1-xCox)(2)As-2 single crystals with improved quality. We demonstrate that the anisotropy in resistivity in the magnetostructural ordered phase arises from the anisotropy in the residual component which increases in proportion to the Co concentration x. This gives evidence that the anisotropy originates from the impurity scattering by Co atoms substituted for the Fe sites, rather than the so far proposed mechanisms such as the anisotropy of Fermi velocities of reconstructed Fermi surface pockets. As doping proceeds to the paramagnetic-tetragonal phase, a Co impurity transforms to a weak and isotropic scattering center.

引用

页数：5

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