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Origin of Magnetism in Al-Pd-Mn and Al-Mn Quasicrystals and Approximants

Published online by Cambridge University Press:  17 March 2011

Françoise Hippert ,
Virginie Simonet ,
Marc Audier ,
Yvonne Calvayrac ,
Robert Bellissent ,
Guy Trambly de Laissardière  and
Didier Mayou
Françoise Hippert
Affiliation:
Laboratoire des Matériaux et du Génie Physique (CNRS), ENSPG, BP46, 38402 Saint Martin d'Hères, France
Virginie Simonet
Affiliation:
Laboratoire de Physique des Solides (CNRS), Bât. 510, Université Paris Sud, 91405 Orsay Cedex, France
Marc Audier
Affiliation:
Laboratoire des Matériaux et du Génie Physique (CNRS), ENSPG, BP46, 38402 Saint Martin d'Hères, France
Yvonne Calvayrac
Affiliation:
CECM (CNRS), 15 rue G. Urbain, F-94407 Vitry Cedex, France
Robert Bellissent
Affiliation:
Laboratoire Léon Brillouin (CEA-CNRS), CE Saclay, 91191 Gif sur Yvette Cedex, France
Guy Trambly de Laissardière
Affiliation:
Laboratoire de Physique Théorique et Modélisation, Université de Cergy-Pontoise, BP 222, 95302 Cergy-Pontoise Cedex, France
Didier Mayou
Affiliation:
LEPES (CNRS), 25 Avenue des Martyrs, BP166X, 38042 Grenoble Cedex, France
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Abstract

Localized moments are observed on a small fraction of the Mn atoms in Al-Pd-Mn and Al-Mn quasicrystals while a large proportion of magnetic moments is found in liquids in equilibrium with these quasicrystalline phases. As magnetic sites cannot be identified in quasicrystals because of the very small number of Mn atoms involved, we have studied the case of approximant phases in both Al-Mn and Al-Pd-Mn systems. Most of the approximants are non- magnetic but magnetic moments are present on a fraction of the Mn sites in the μ-Al4Mn phase and in the Mn-rich TAlPdMn phase. From both experimental and theoretical investigations, the magnetic sites are identified in these phases. The moment formation can be explained by analysing the local environment of the Mn atoms and indirect Mn-Mn interactions mediated by conduction electrons on relatively large distances. A clear picture of the origin of magnetism in quasicrysals, approximants and liquids in the Al-Mn and Al-Pd-Mn systems can therefore be obtained.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 643: Symposium K – Quasicrystals-Preparation, Properties, and Applications , 2000 , K14.2
Copyright
Copyright © Materials Research Society 2001

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