Abstract
Both neutron diffraction experiments and 57Fe Mössbauer measurements have been performed on powder samples of the HfFe 6Ge 6-type RFe 6Ge 6 compounds (R=Sc, Ti, Zr, Hf, Nb). These compounds are characterized by an antiferromagnetic stacking along the c-axis of ferromagnetic (001) Fe planes, the easy-direction of magnetization being along [001]. However, for R=Ti, Zr and Nb, we observe that, at 4.2 K, ≈30% of iron atoms have moments which deviate from the c-axis. Both the ordered magnetic moment and the hyperfine field on iron atoms are found to increase with the R valency. This observation is tentatively attributed to an increase of the hybridization of the d valence states of the R metal with the 3d iron states.
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