Degradation of superconductivity and spin fluctuations by electron overdoping in LaFeAsO1-xFx

Shuichi Wakimoto, Katsuaki Kodama, Motoyuki Ishikado, Masaaki Matsuda, Ryoichi Kajimoto, Masatoshi Arai, Kazuhisa Kakurai, Fumitaka Esaka, Akira Iyo, Hijiri Kito, Hiroshi Eisaki, Shin Ichi Shamoto

Research output: Contribution to journalArticlepeer-review

51 Scopus citations

Abstract

Low-energy spin fluctuations are studied for the electron-doped Fe-based superconductor LaFeAs-O1-xFx by inelastic neutron scattering up to an energy transfer of ω = 15 meV using polycrystalline samples. Superconducting samples (x = 0.057, Tc = 25K and x = 0.082, Tc = 29 K) show a dynamical spin susceptibility χ"(ω) comparable to that of the parent samples. However, χ"(ω) almost vanishes in the x = 0.158 sample, in which the superconductivity is highly suppressed. These results are compatible with the theoretical suggestions that spin fluctuation plays an important role in superconductivity.

Original languageEnglish
Article number074715
JournalJournal of the Physical Society of Japan
Volume79
Issue number7
DOIs
StatePublished - Jul 2010
Externally publishedYes

Funding

Keywords

  • Inelastic neutron scattering
  • Iron pnictide superconductor
  • LaFeAsOF
  • Spin fluctuation
  • Superconductivity

Fingerprint

Dive into the research topics of 'Degradation of superconductivity and spin fluctuations by electron overdoping in LaFeAsO1-xFx'. Together they form a unique fingerprint.

Cite this