Quasicrystals pp 487-504 | Cite as

Magnetic Properties of Quasicrystals and Approximants

  • Guy Trambly de Laissardière
  • Didier Mayou
Part of the Springer Series in Materials Science book series (SSMATERIALS, volume 55)

Summary

In this chapter we discuss the localized magnetism of quasicrystals and approximants. We focus in particular on the conditions for occurrence of local moments carried by the transition atoms. The systems which are the most interesting in this context are those containing Mn. We recall first the basic model concerning TM impurities in free-electron metals like Al, Cu, Ag,…. Yet there is good evidence that this classical model (virtual bound state of Friedel and Anderson) is not applicable to quasicrystals and approximants and more generally to many Hume—Rothery-type alloys that are stabilized by a pronounced pseudo-gap close to the Fermi energy. We then develop two types of model that allow an analysis of the occurrence of local magnetic moments. The pseudo-gap at the Fermi energy is shown to have a deep effect on the conditions for the appearance of moments and the theoretical analyzes are consistent both with ab initio calculations and with experimental results.

Keywords

Manganese Ferro AgCr 

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Copyright information

© Springer-Verlag Berlin Heidelberg 2002

Authors and Affiliations

  • Guy Trambly de Laissardière
    • 1
  • Didier Mayou
  1. 1.Laboratoire de Physique Théorique et Modélisation (LPTM)Universtié de Cergy-PontoiseCergy-Pontoise CedexFrance

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