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

研究成果: Article同行評審

51 引文 斯高帕斯(Scopus)

摘要

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.

原文English
文章編號074715
期刊Journal of the Physical Society of Japan
79
發行號7
DOIs
出版狀態Published - 2010 7月

All Science Journal Classification (ASJC) codes

  • 一般物理與天文學

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