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We use inelastic neutron scattering to study the low-energy spin excitations of polycrystalline samples of nonsuperconducting CeFeAsO and superconducting CeFeAsO0.84F0.16. Two sharp dispersionless modes are found at 0.85 and 1.16 meV in CeFeAsO below the Ce antiferromagnetic (AF) ordering temperature of TNCe ˜ 4 K. On warming to above TNCe ˜ 4 K, these two modes become one broad dispersionless...
We report on a comparative optical investigation on EuFe2As2 and LaFeAsO polycrystalline samples. The spin-density wave (SDW) partial gap is observed for both compounds. The gap-like absorption peaks in the real part of conductivity for EuFe2As2 and LaFeAsO scale with their respective TSDW. Most remarkably, the study reveals a substantial difference in optical reflectance spectra for the two prototype...
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