Abstract
We have stabilized a new ytterbium-based ternary derivative of the CoSn-type (P6/mmm) FeSn compound whose chemical composition is Yb ∼0.6Fe 6Sn 6. The crystal structure of this compound can be viewed as a lacunary isotype of the SmMn 6Sn 6 type of structure (P6/mmm), a partly disordered variant of the HfFe 6Ge 6-type. Powder neutron diffraction experiments indicate that Yb ∼0.6Fe 6Sn 6 adopts an antiferromagnetic arrangement (+−+−) built upon ferromagnetic (0 0 1) Fe planes, with the iron moments in the basal plane (μ Fe=1.87(2) μ B at 2 K). No magnetic ordering of the ytterbium sublattice is detected down to 2 K. These findings are corroborated by 57 Fe and 119 Sn Mössbauer spectroscopy experiments. The local orthorombic symmetry of the iron site allows observing anisotropic contributions to the total iron hyperfine field. As a consequence of the ytterbium under-stoichiometry, the magnitude of the transferred hyperfine field on Sn(2e) nuclei is found to be slightly distributed with a mean value of 〈 H〉=12.5 T. The results are related and discussed to previously published data concerning other R 1− δ Fe 6Sn 6 representatives as well as the binary FeSn parent compound.
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