Variation in Electronic State of Ba(Fe1-xCox)2AS2 Alloy as Investigated in Terms of Transport Properties

被引：20

作者：

Katayama, Naoyuki ^{[1
]}

Kiuchi, Yoko ^{[1
]}

Matsushita, Yoshitaka ^{[2
]}

Ohgushi, Kenya ^{[1
,3
]}

机构：

[1] Univ Tokyo, Inst Solid State Phys, Chiba 2778581, Japan

[2] Beamline BL15XU, SPring8, NIMS Branch Off, Sayo, Hyogo 6795148, Japan

[3] JST, TRIP, Chiyoda Ku, Tokyo 1020075, Japan

来源：

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN | 2009年 / 78卷 / 12期

基金：

日本学术振兴会;

关键词：

iron arsenide superconductor; BaFe2As2; BaCo2As2; Hall effect; SUPERCONDUCTOR;

D O I：

10.1143/JPSJ.78.123702

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We investigate the in-plane transport properties of the electron-doped iron arsenide superconductor Ba(Fe1-xCox)(2)As-2 (0 <= x <= 1). We observe a non-Fermi-liquid behavior characterized by an incoherent resistivity and a low-temperature increase in Hall coefficient (R-H) at x <= 0.14. We discuss this feature in terms of antiferromagnetic fluctuations. We find that the effective carrier density per Fe/Co atom n(eff) = -V/(eR(H)) (V is the volume per Fe/Co atom and e is the elementary electric charge) at 250 K exhibits a nonmonotonic x dependence with a minimum value at x similar to 0.1, which is considered to reflect the disappearance of hole Fermi surfaces. We discuss the interrelationships among superconductivity, magnetism, and band nesting.

引用

页数：4

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