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

Abstract

We investigated the low energy excitations in the parent compound NdFeAsO of the Fe-pnictide superconductor in the $\mu$eV range by a back scattering neutron spectrometer. The energy scans on a powder NdFeAsO sample revealed inelastic peaks at E = 1.600 $\pm 0.003\mu$eV at T = 0.055 K on both energy gain and energy loss sides. The inelastic peaks move gradually towards lower energy with increasing temperature and finally merge with the elastic peak at about 6 K. We interpret the inelastic peaks to be due to the transition between hyperfine-split nuclear level of the ${}^{143}$Nd and ${}^{145}$Nd isotopes with spin $I=7/2$. The hyperfine field is produced by the ordering of the electronic magnetic moment of Nd at low temperature and thus the present investigation gives direct evidence of the ordering of the Nd magnetic sublattice of NdFeAsO at low temperature.

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Cited by in corpus (6)

• Inelastic neutron scattering study of crystal field excitations of Nd3+ in NdFeAsO
• Slow magnetic fluctuations and superconductivity in fluorine-doped NdFeAsO
• Iron spin-reorientation transition in NdFeAsO
• Direct evidence for the magnetic ordering of Nd ions in NdMn${}_2$Si${}_2$ and NdMn${}_2$Ge${}_2$ by high resolution inelastic neutron scattering
• Hyperfine interaction in CoCl${}_2$ investigated by high resolution neutron spectroscopy
• Direct observation of low energy nuclear spin excitations in HoCrO${}_3$ by high resolution neutron spectroscopy