Abstract
Bulk magnetization and neutron diffraction measurements have been performed on the new HfFe6Ge6-type (P6/mmm) ZrMn6Sn6 and HfMn6Sn6 compounds. These compounds order antiferromagnetically below 580(5) and 575(5) K for R=Zr and Hf, respectively. At 300 K, both compounds exhibit a collinear easy-plane antiferromagnetic arrangement and the magnetic structure consists of ferromagnetic (001) Mn planes antiferromagnetically coupled along the c-axis with the (+−−+) sequence, i.e. a doubling of the c-axis of the chemical cell (μMn=1.98(7) μB and μMn=2.05(6) μB for ZrMn6Sn6 and HfMn6Sn6, respectively). At approximately 60 K, a commensurate–incommensurate transition occurs for both compounds, yielding an helical magnetic structure characterized by a thermal dependent k=〈00qz〉 wave vector. At 2 K, qz=0.491(1) and 0.481(1) r.l.u., while μMn=2.11(3) μB and 2.18(2) μB for ZrMn6Sn6 and HfMn6Sn6, respectively. A comparison with other RMn6Sn6 compounds involving a non-magnetic R element (R=Mg, Sc, Lu, Y) allows us to underline the influence of the R valency on the magnetic behavior of the Mn sublattice in this class of materials.
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