A Magnetic and ⁵⁷Fe Mössbauer Spectral Study of the Hf₍₁₋ₓ₎RₓFe₆Ge₆ (R = Gd and Dy) Compounds

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.

Meeting Name

International Conference on the Industrial Applications of the Mossbauer Effect (2004: Oct. 4-8, Madrid, Spain)

Department(s)

Chemistry

Sponsor(s)

Consejo Superior de Investigaciones Cientificas, Madrid

International Standard Book Number (ISBN)

978-0735402508

International Standard Serial Number (ISSN)

0094-243X

Document Type

Article - Conference proceedings

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2005 American Institute of Physics (AIP), All rights reserved.

Publication Date

08 Oct 2004

Link to Full Text

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