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Low-energy spin excitations have been studied on polycrystalline LaFeAsO1−xFx samples by inelastic neutron scattering. The Q-integrated dynamical spin susceptibility χ″(ω) of the superconducting samples is found to be comparable to that of the magnetically ordered parent sample. On the other hand, χ″(ω) almost vanishes at x=0.158, where the superconducting transition temperature Tc is suppressed to...
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