Spin reorientation in Na-doped BaFe$_2$As$_2$ studied by neutron diffraction

F. Wasser; A. Schneidewind; Y. Sidis; S. Aswartham; S. Wurmehl; B. Buchner; M. Braden

doi:10.1103/PhysRevB.91.060505

Spin reorientation in Na-doped BaFe$_2$As$_2$ studied by neutron diffraction

Superconductivity 2015-06-22 v1

Authors: F. Wasser , A. Schneidewind , Y. Sidis , S. Aswartham , S. Wurmehl , B. Buchner , M. Braden

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Abstract

We have studied the magnetic ordering in Na doped BaFe $_2$ As $_2$ by unpolarized and polarized neutron diffraction using single crystals. Unlike previously studied FeAs-based compounds that magnetically order, Ba $_{1-x}$ Na $_x$ Fe $_2$ As $_2$ exhibits two successive magnetic transitions: For x=0.35 upon cooling magnetic order occurs at $\sim$ 70\ K with in-plane magnetic moments being arranged as in pure or Ni, Co and K-doped BaFe $_2$ As $_2$ samples. At a temperature of $\sim$ 46\ K a second phase transition occurs, which the single-crystal neutron diffraction experiments can unambiguously identify as a spin reorientation. At low temperatures, the ordered magnetic moments in Ba $_{0.65}$ Na $_{0.35}$ Fe $_2$ As $_2$ point along the $c$ direction. Magnetic correlations in these materials cannot be considered as Ising like, and spin-orbit coupling must be included in a quantitative theory.

Keywords

spin reorientation Na-doped BaFe2As2 neutron diffraction magnetic ordering single crystals spin-orbit coupling magnetic phase transition iron-based superconductors

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@article{arxiv.1407.1417,
  title  = {Spin reorientation in Na-doped BaFe$_2$As$_2$ studied by neutron diffraction},
  author = {F. Wasser and A. Schneidewind and Y. Sidis and S. Aswartham and S. Wurmehl and B. Buchner and M. Braden},
  journal= {arXiv preprint arXiv:1407.1417},
  year   = {2015}
}

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5 pages, 4 figures

Spin reorientation in Na-doped BaFe$_2$As$_2$ studied by neutron diffraction

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