Hyperfine Interactions

, Volume 1, Issue 1, pp 469–483 | Cite as

Time-dependent hyperfine interactions in moderately diluted Ni(Hf)

  • E. Gerdau
  • H. Winkler
  • B. Giese
  • W. Gebert
  • J. Braunsfurth
Article

Abstract

The magnetic hyperfine interaction of181Ta in Ni(Hf) has been measured as a function of temperature by means of the time differential γγ angular correlation technique. While for very low concentrations of less than 10−4 a pure static interaction is observed, which follows the bulk magnetization apart from small deviations, spectra obtained from a source with 1·10−3 Hf content show a more complex behaviour.

From the comparison of the experimental data with theoretical spectra, which result from various dynamical models, we conclude that for a Hf concentration of 1·10−3 the impurity-impurity interaction causes a local breakdown of the ferromagnetic ordering near the Curie point. The arising paramagnetic domains may change their geometrical form and position so that a probe nucleus is subject to a time-dependent hyperfine interaction.

Keywords

Static Interaction Complex Behaviour Hyperfine Interaction Angular Correlation Curie Point 

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Copyright information

© North-Holland Publishing Company 1975

Authors and Affiliations

  • E. Gerdau
    • 1
  • H. Winkler
    • 1
  • B. Giese
    • 1
  • W. Gebert
    • 1
  • J. Braunsfurth
    • 1
  1. 1.II. Institut für Experimentalphysik der Unviersität HamburgHamburgGermany

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