Iron spin-reorientation transition in NdFeAsO

A. Marcinkova; T. C. Hansen; J. W. G. Bos

doi:10.1088/0953-8984/24/25/256007

Iron spin-reorientation transition in NdFeAsO

Superconductivity 2012-06-08 v1

Authors: A. Marcinkova , T. C. Hansen , J. W. G. Bos

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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.

Keywords

NdFeAsO spin-reorientation transition neutron powder diffraction magnetic structure Fe moments Nd moments symmetry analysis

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@article{arxiv.1205.4312,
  title  = {Iron spin-reorientation transition in NdFeAsO},
  author = {A. Marcinkova and T. C. Hansen and J. W. G. Bos},
  journal= {arXiv preprint arXiv:1205.4312},
  year   = {2012}
}

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accepted to J. Phys.: Cond. Mat

Iron spin-reorientation transition in NdFeAsO

Abstract

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