A Magnetic and 57Fe Mössbauer Spectral Study of the Hf1-xRxFe6Ge6 (R = Gd and Dy) Compounds
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.
N. Plugaru et al., "A Magnetic and 57Fe Mössbauer Spectral Study of the Hf1-xRxFe6Ge6 (R = Gd and Dy) Compounds," AIP Conference Proceedings, vol. 765, pp. 239-244, American Institute of Physics (AIP), Apr 2005.
The definitive version is available at http://dx.doi.org/10.1063/1.1923662
International Conference on the Industrial Applications of the Mossbauer Effect (2004: Oct. 4-8, Madrid; Spain)
Consejo Superior de Investigaciones Cientificas, Madrid
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