Variation in electronic state of Ba(Fe 1-xCo x) 2As 2 alloy as investigated in terms of transport properties

Naoyuki Katayama; Yoko Kiuchi; Yoshitaka Matsushita; Kenya Ohgushi

doi:10.1143/JPSJ.78.123702

Variation in electronic state of Ba(Fe _1-xCo _x) ₂As ₂ alloy as investigated in terms of transport properties

Naoyuki Katayama, Yoko Kiuchi, Yoshitaka Matsushita, Kenya Ohgushi

Research output: Contribution to journal › Article › peer-review

20 Citations (Scopus)

Abstract

We investigate the in-plane transport properties of the electron-doped iron arsenide superconductor Ba(Fe _1-xCo _x) ₂As 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 ∼ 0:1, which is considered to reflect the disappearance of hole Fermi surfaces. We discuss the interrelationships among superconductivity, magnetism, and band nesting.

Original language	English
Article number	123702
Journal	journal of the physical society of japan
Volume	78
Issue number	12
DOIs	https://doi.org/10.1143/JPSJ.78.123702
Publication status	Published - 2009 Dec 1
Externally published	Yes

Keywords

BaCo As
BaFe As
Hall effect
Iron arsenide superconductor

ASJC Scopus subject areas

Physics and Astronomy(all)

Access to Document

10.1143/JPSJ.78.123702

Cite this

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title = "Variation in electronic state of Ba(Fe 1-xCo x) 2As 2 alloy as investigated in terms of transport properties",

abstract = "We investigate the in-plane transport properties of the electron-doped iron arsenide superconductor Ba(Fe 1-xCo x) 2As 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 ∼ 0:1, which is considered to reflect the disappearance of hole Fermi surfaces. We discuss the interrelationships among superconductivity, magnetism, and band nesting.",

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T1 - Variation in electronic state of Ba(Fe 1-xCo x) 2As 2 alloy as investigated in terms of transport properties

AU - Katayama, Naoyuki

AU - Kiuchi, Yoko

AU - Matsushita, Yoshitaka

AU - Ohgushi, Kenya

PY - 2009/12/1

Y1 - 2009/12/1

N2 - We investigate the in-plane transport properties of the electron-doped iron arsenide superconductor Ba(Fe 1-xCo x) 2As 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 ∼ 0:1, which is considered to reflect the disappearance of hole Fermi surfaces. We discuss the interrelationships among superconductivity, magnetism, and band nesting.

AB - We investigate the in-plane transport properties of the electron-doped iron arsenide superconductor Ba(Fe 1-xCo x) 2As 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 ∼ 0:1, which is considered to reflect the disappearance of hole Fermi surfaces. We discuss the interrelationships among superconductivity, magnetism, and band nesting.

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KW - BaFe As

KW - Hall effect

KW - Iron arsenide superconductor

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