Variation in Electronic State of Ba(Fe1-xCox)2As2 Alloy as Investigated in Terms of Transport Properties
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概要
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We investigate the in-plane transport properties of the electron-doped iron arsenide superconductor Ba(Fe1-xCox)2As2 ($0\leq x\leq 1$). We observe a non-Fermi-liquid behavior characterized by an incoherent resistivity and a low-temperature increase in Hall coefficient ($R_{\text{H}}$) at $x\leq 0.14$. We discuss this feature in terms of antiferromagnetic fluctuations. We find that the effective carrier density per Fe/Co atom $n_{\text{eff}} = -V/(eR_{\text{H}})$ ($V$ 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 $x\sim 0.1$, which is considered to reflect the disappearance of hole Fermi surfaces. We discuss the interrelationships among superconductivity, magnetism, and band nesting.
- 2009-12-15
著者
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Kiuchi Yoko
Institute For Solid State Physics University Of Tokyo
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Ohgushi Kenya
Institute For Solid State Physics University Of Tokyo
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Katayama Naoyuki
Institute For Solid State Physics The University Of Tokyo
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Kiuchi Yoko
Institute for Solid State Physics, University of Tokyo, Kashiwanoha, Kashiwa, Chiba 277-8581
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Matsushita Yoshitaka
Beamline BL15XU, SPring8, NIMS-branch office, 1-1-1 Kohto, Sayo, Hyogo 679-5148
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Katayama Naoyuki
Institute for Solid State Physics, University of Tokyo, Kashiwanoha, Kashiwa, Chiba 277-8581
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