Journal of the Physical Society of Japan
Online ISSN : 1347-4073
Print ISSN : 0031-9015
ISSN-L : 0031-9015
Variation in Electronic State of Ba(Fe1−xCox)2As2 Alloy as Investigated in Terms of Transport Properties
Naoyuki KatayamaYoko KiuchiYoshitaka MatsushitaKenya Ohgushi
ジャーナル 認証あり

2009 年 78 巻 12 号 p. 123702


We investigate the in-plane transport properties of the electron-doped iron arsenide superconductor Ba(Fe1−xCox)2As2 (0≤x≤1). We observe a non-Fermi-liquid behavior characterized by an incoherent resistivity and a low-temperature increase in Hall coefficient (RH) at x≤0.14. We discuss this feature in terms of antiferromagnetic fluctuations. We find that the effective carrier density per Fe/Co atom neff=−V⁄(eRH) (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∼0.1, which is considered to reflect the disappearance of hole Fermi surfaces. We discuss the interrelationships among superconductivity, magnetism, and band nesting.



© The Physical Society of Japan 2009
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