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The spin excitations in the LaFeAsO1−xFx system have been studied by inelastic neutron scattering measurements with powder samples. In the parent compound, the spin excitation was observed as a magnetic rod at (π,π,l) in the downfolded tetragonal Brillouin zone. It persisted even in the tetragonal phase at T=280K. In the superconducting compounds with x=0.057 and 0.082, the spin excitations developed...
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