Hyperfine Interactions

, Volume 219, Issue 1–3, pp 49–55 | Cite as

Critical behaviour of Ho2Fe17 − xMnx—magnetisation and Mössbauer spectroscopy

  • J. L. Wang
  • S. J. Campbell
  • S. J. Kennedy
  • S. X. Dou
Article
  • 82 Downloads

Abstract

The magnetic properties of Ho2Fe17 − xMnx compounds (x = 0–2) of ferromagnetic ordering temperatures up to TC ~344 K have been investigated by DC magnetization and Mössbauer effect measurements. The nature of the magnetic phase transitions and the critical behaviour around TC has been investigated by analysis of the magnetisation data and the critical exponents β, γ and δ determined. The critical exponents are found to be similar to the theoretical values of the mean-field model for which β = 0.5 and γ = 1.0, indicating the existence of a long-range ferromagnetic interactions. The isothermal entropy changes ΔS around TC have been determined as a function of temperature in different magnetic fields.

Keywords

Magnetisation Mössbauer spectroscopy Critical exponents Magnetocaloric  Ho2Fe17 − xMnx 

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Copyright information

© Springer Science+Business Media Dordrecht 2012

Authors and Affiliations

  • J. L. Wang
    • 1
    • 2
    • 3
  • S. J. Campbell
    • 3
  • S. J. Kennedy
    • 2
  • S. X. Dou
    • 1
  1. 1.Institute for Superconductivity and Electronic MaterialsUniversity of WollongongWollongongAustralia
  2. 2.Bragg InstituteANSTOMenaiAustralia
  3. 3.School of Physical, Environmental and Mathematical SciencesThe University of New South WalesCanberraAustralia

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