Abstract
The new hexagonal HfFe6Ge6-type ZrMn6Ge6 compound orders antiferromagnetically below TN=640K and undergoes a second transition at Tt=50K. Neutron diffraction experiments were performed on the three ZrMn6Ge6, LuMn6Ge6 and ScMn6Ge6 compounds. At 300K, they exhibit collinear easy-axis antiferromagnetic arrangements and the magnetic structure consists of ferromagnetic (001) Mn planes antiferromagnetically coupled along the c-axis with a (+−−+) sequence (μMn≈2.06, 1.86 and 1.94μB for Zr-, Lu- and ScMn6Ge6, respectively). At low temperature, spin reorientation processes occur, yielding incommensurate antiferromagnetic arrangements. Below Tt, in both ZrMn6Ge6 and LuMn6Ge6 (Tt∽30K), the Mn moments form a double-cone structure (μMn≈2.1μB, semi-cone angle α≈6°) as already found in YMn6Ge6 (Tt∽80K) whereas only preliminary results are available for ScMn6Ge6 below Tt=255K. These results lead us to strongly revise previous conclusions concerning LuMn6Ge6 and ScMn6Ge6 with more reasonable Mn magnetic moment values (∽2μB against the ∽1μB value previously published).
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