Magnetism in Al(Si)-Mn quasicrystals and related phases.
An extreme sensitivity of the magnetic properties to the atomic structure has been observed in Al(Si)-Mn and Al-Pd-Mn quasicrystals, approximants, and liquids with similar Mn concentrations (of the order of 8%- 20%). Here, we show that the effect of the local environment of the Mn atoms is not sufficient to explain this complex behavior. A new model is presented, which, taking into account Mn-Mn interactions mediated by the conduction electrons over large distances ( 5 A and more), allows one to understand why only a small fraction of the Mn atoms carry a localized magnetic moment in quasicrystals and why a large proportion is magnetic in liquids.
Trambly de Laissardière
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Laboratoire de Physique Théorique et Modélisation (ESA 8089), Université de Cergy-Pontoise, Neuville, 95031 Cergy-Pontoise, France.
Mayou
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