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

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.

arXiv comment5 pages, 4 figures

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