Abstract
We present a detailed magnetic and 57Fe Mössbauer spectroscopy study of the Hf1−xRxFe6Ge6, R = Gd or Dy, series. The macroscopic magnetic measurements are consistent with the magnetic independence of both the R and Fe sublattices. However, the 57Fe Mössbauer study reveals a more complex magnetic behavior. In particular, we have observed that below T = 95 K a spin reorientation process takes place in the non‐magnetic member of the series, the HfFe6Ge6 compound. The fit of the corresponding Mössbauer spectra allow us to conclude that at T < 95 K, a fraction γ(T) of the iron moments is deviated from the c‐axis. The substitution of Hf by Gd or Dy reduces the fraction γ(T) of the iron canted moments. The hyperfine magnetic fields are found to decrease upon the progressive R = Gd or Dy substitution. This effect can be qualitatively explained as a consequence of the decrease in the hybridization between the d valence states of the R element with the 3d iron states.
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