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Degradation of superconductivity and spin fluctuations by electron overdoping in LaFeAsO$$_{1-x}$$F$$_{x}$$

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

Low energy spin fluctuations are studied for the electron-doped Fe-based superconductor LaFeAsO$$_{1-x}$$F$$_x$$ by inelastic neutron scattering up to the energy transfer of $$omega = 15$$ meV using polycrystalline samples. Superconducting samples ($$x=0.057$$, $$T$$$$_{rm c}$$ = 25 K and $$x=0.082$$, $$T$$$$_{rm c}$$ = 29 K) show dynamical spin susceptibility $$chi"(omega)$$ almost comparable with the parent sample's. However $$chi"(omega)$$ is almost vanished in the $$x=0.158$$ sample where the superconductivity is highly suppressed. These results are compatible with the theoretical suggestions that the spin fluctuation plays an important role for the superconductivity.

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Category:Physics, Multidisciplinary

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