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We investigated the low energy excitations in the parent compound NdFeAsO ofthe Fe-pnictide superconductor in the $\mu$eV range by a back scatteringneutron spectrometer. The energy scans on a powder NdFeAsO sample revealedinelastic peaks at E = 1.600 $ \pm 0.003 \mu$eV at T = 0.055 K on both energygain and energy loss sides. The inelastic peaks move gradually towards lowerenergy with increasing temperature and finally merge with the elastic peak atabout 6 K. We interpret the inelastic peaks to be due to the transition betweenhyperfine-split nuclear level of the $^{143}$Nd and $^{145}$Nd isotopes withspin $I = 7/2$. The hyperfine field is produced by the ordering of theelectronic magnetic moment of Nd at low temperature and thus the presentinvestigation gives direct evidence of the ordering of the Nd magneticsublattice of NdFeAsO at low temperature.

Direct evidence for the magnetic ordering of Nd ions in NdFeAsO by high resolution inelastic neutron scattering