Iron spin-reorientation transition in NdFeAsO

Abstract

The low-temperature magnetic structure of NdFeAsO has been revisited using neutron powder diffraction and symmetry analysis using the Sarah representational analysis program. Four magnetic models with one magnetic variable for each of the Nd and Fe sublattices were tested. The best fit was obtained using a model with Fe moments pointing along the c-direction, and Nd moments along the a-direction. This signals a significant interplay between rare-earth and transition metal magnetism, which results in a spin-reorientation of the Fe sublattice upon ordering of the Nd moments. All models that fit the data well, including collinear models with more than one magnetic variable per sublattice, were found to have an Fe moment of 0.5 BM and a Nd moment of 0.9 BM, demonstrating that the low-temperature Fe moment is not substantially enhanced compared to the spin-density wave (SDW) state.

accepted to J. Phys.: Cond. Mat

References in corpus (7)

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• Inelastic neutron scattering study of crystal field excitations of Nd3+ in NdFeAsO
• Crystal field excitations and magnons: their roles in oxyselenides Pr2O2M2OSe2 (M = Mn, Fe)
• Isovalent substitution effects of arsenic on structural and electrical properties of iron-based superconductor NdFeAsO0.8F0.2