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

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20 Citations (Scopus)


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 languageEnglish
Article number123702
Journaljournal of the physical society of japan
Issue number12
Publication statusPublished - 2009 Dec 1
Externally publishedYes


  • BaCo As
  • BaFe As
  • Hall effect
  • Iron arsenide superconductor

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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