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Inelastic neutron scattering study of low-energy spin excitations on LaFeAsO$$_{1-x}$$F$$_{x}$$ system

Shamoto, Shinichi  ; Ishikado, Motoyuki*; Wakimoto, Shuichi ; Kodama, Katsuaki  ; Kajimoto, Ryoichi*  ; Arai, Masatoshi

Low-energy spin excitations on polycrystalline LaFeAsO$$_{1-x}$$F$$_{x}$$ samples have been studied by inelastic neutron scattering. The dynamical spin susceptibility $$chi$$"($$omega$$) of the superconducting (SC) samples is found to be comparable to that of the magnetically ordered parent sample. On the other hand, $$chi$$"($$omega$$) almost vanishes at x=0.158, where the SC transition temperature T$$_{c}$$ is suppressed to 7 K. This result suggests that the low energy spin excitations are closely connected with high-T$$_{c}$$ superconductivity.

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