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Détérioration du liquide de Fermi lors de la phase paramagnétique d'un métal pur.

Fermi-liquid breakdown in the paramagnetic phase of a pure metal.

Auteurs : DOIRON-LEYRAUD N., WALKER I. R., TAILLEFER F., et al.

Type d'article : Article

Résumé

Fermi-liquid theory (the standard model of metals) has been challenged by the discovery of anomalous properties in an increasingly large number of metals. The anomalies often occur near a quantum critical point - a continuous phase transition in the limit of absolute zero, typically between magnetically ordered and paramagnetic phases. Although not understood in detail, unusual behaviour in the vicinity of such quantum critical points was anticipated nearly three decades ago by theories going beyond the standard model. The authors report electrical resistivity measurements of the 3d metal MnSi, indicating an unexpected breakdown of the Fermi-liquid model. In this regime, corrections to the Fermi-liquid model are expected to be small. The range in pressure, temperature and applied magnetic field over which the authors observe an anomalous temperature dependence of the electrical resistivity in MnSi is not consistent with the crossover behaviour widely seen quantum critical systems. This may suggest the emergence of a well defined but enigmatic quantum phase of matter.

Détails

  • Titre original : Fermi-liquid breakdown in the paramagnetic phase of a pure metal.
  • Identifiant de la fiche : 2004-1958
  • Langues : Anglais
  • Source : Nature - vol. 425 - n. 6958
  • Date d'édition : 09/10/2003
  • Document disponible en consultation à la bibliothèque du siège de l'IIF uniquement.

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