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Une relation universelle de graduation dans les supraconducteurs à haute température.

A universal scaling relation in high-temperature superconductors.

Auteurs : HOMES C. C., DORDEVIC S. V., STRONGIN M., et al.

Type d'article : Article

Résumé

Since the discovery of superconductivity at elevated temperatures in the copper oxide materials there has been a considerable effort to find universal trends and correlations amongst physical quantities, as a clue to the origin of the superconductivity. One of the earliest patterns that emerged was the linear scaling of the superfluid density with the superconducting transition temperature (Tc), which marks the onset of phase coherence. This is referred to as the Uemura relation, and it works reasonably well for the underdoped materials. It does not, however, describe optimally doped (where Tc is a maximum) or overdoped materials. Similarly, an attempt to scale the superfluid density with the d.c. conductivity was only partially successful. The authors report a simple scaling relation that holds for all tested high-Tc materials. It holds regardless of doping level, nature of dopant (electrons versus holes), crystal structure and type of disorder, and direction (parallel or perpendicular to the copper-oxygen planes).

Détails

  • Titre original : A universal scaling relation in high-temperature superconductors.
  • Identifiant de la fiche : 2005-0009
  • Langues : Anglais
  • Source : Nature - vol. 430 - n. 6999
  • Date d'édition : 29/07/2004

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