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

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51 Citations (Scopus)


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
Issue number7
Publication statusPublished - 2010 Jul

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy


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