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La géométrie bidimensionnelle des excitations spin dans le supraconducteur à haute température de transition YBa2Cu3O6+x.

Two-dimensional geometry of spin excitations in the high-transition-temperature superconductor YBa2Cu3O6+x.

Auteurs : HINKOV V., PAILHÈS S., BOURGES P., et al.

Type d'article : Article

Résumé

The fundamental building block of the copper oxide superconductors is a Cu4O4 square plaquette. The plaquettes in most of these materials are slightly distorted to form a rectangular lattice, for which an influential theory predicts that high-transition-temperature (high-Tc) superconductivity is nucleated in 'stripes' aligned along one of the axes. This theory received strong support from experiments that indicated a one-dimensional character for the magnetic excitations in the high-Tc material YBa2Cu3O6.6. The authors report neutron scattering data on 'untwinned' YBa2Cu3O6+x crystals, in which the orientation of the rectangular lattice is maintained throughout the entire volume. Contrary to the earlier claim, we demonstrate that the geometry of the magnetic fluctuations is two-dimensional. Rigid stripe arrays therefore appear to be ruled out over a wide range of doping levels in YBa2Cu3O6+x, but the data may be consistent with liquid-crystalline stripe order. The debate about stripes has therefore been reopened.

Détails

  • Titre original : Two-dimensional geometry of spin excitations in the high-transition-temperature superconductor YBa2Cu3O6+x.
  • Identifiant de la fiche : 2005-0011
  • Langues : Anglais
  • Source : Nature - vol. 430 - n. 7000
  • Date d'édition : 05/08/2004

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