Ferromagnetic spin fluctuation in LaFeAsO1-x Fx

Yoshimitsu Kohama, Yoichi Kamihara, Masahiro Hirano, Hitoshi Kawaji, Tooru Atake, Hideo Hosono

Research output: Contribution to journalArticle

49 Citations (Scopus)

Abstract

The F-doped LaFeAsO-a recently discovered superconductor with the high Tc of 26 K-has been studied using the resistivity (ρ), magnetic-susceptibility (χ), and heat-capacity (Cp) measurements in the F doping range 0≤x≤0.14 (LaFeAsO1-x Fx). In the low-temperature region, a T3 lnT term in Cp and a T2 term in χ -which are derived from the spin fluctuation-are observed. The nearly ferromagnetic nature evidenced by a large Wilson ratio (6.5 for x=0 and 11.2 for x=0.025) suggests that the superconductivity in the LaFeAsO system is mediated by ferromagnetic spin fluctuation.

Original languageEnglish
Article number020512
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume78
Issue number2
DOIs
Publication statusPublished - 2008 Jul 29
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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