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Centres d'ancrage artificiels dans des composites niobium-cuivre produits suivant la technique du "jelly-roll".

Artificial pinning centres in jelly-roll processed niobium-copper composites.

Auteurs : KITAI T., HIGUCHI M., OSAMURA K.

Type d'article : Article

Résumé

In order to clarify the mechanism concerning the enhancement of critical-current density due to artificial pinning centres, nanometer scale niobium-copper multilayer composites have been prepared from niobium and copper foils by the jelly-roll process. The layer thickness of the specimen was chosen using a calculation based on the phenomenological Ginzburg-Landau theory. The microstructure of the composite was investigated by scanning electron microscopy. The critical-current density and critical temperature were measured at various magnetic fields. A remarkable increase in the critical-current density was found when the layer thickness was approximately the same scale as the vortex lattice parameter. However, samples with thinner layers showed lower critical-temperature values due to the proximity effect.

Détails

  • Titre original : Artificial pinning centres in jelly-roll processed niobium-copper composites.
  • Identifiant de la fiche : 1998-1477
  • Langues : Anglais
  • Source : Cryogenics - vol. 37 - n. 7
  • Date d'édition : 07/1997

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