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Investigation of the electrical-resistivity behavior between the Kosterlitz-Thouless temperature and the Ginzburg-Landau temperature in spray-dried bulk Bi2Sr2CaCu2O8 + d the role of two-dimensional fluctuations and defects

par Ausloos, Marcel;Bougrine, Hassan;Duvigneaud, Paul-Henri ;Guo, Yufen Y.F.
Référence Physica. C, Superconductivity, 251, 3-4, page (337-347)
Publication Publié, 1995-09

Article révisé par les pairs

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Résumé :

The resistive transition R(T) between the Kosterlitz-Thouless temperature and the Ginzburg-Landau temperature was studied in spray-dried bulk Bi2Sr2CaCu2O8 + d superconductors for a magnetic-field range between 0 and 0.3 T. The samples were prepared by the spray-drying technique with Bi2 + xSr2 - x - yCa2 + yCu2O8 + d for x = y = 0.05 or 0.1 as a starting composition here. The data analysis was performed assuming various resistive laws previously proposed. When numerically analyzed in terms of a two-dimensional Kosterlitz-Thouless theory the results lead to remarkable quantitative agreement. This implies that the R(T) behavior can be described within a picture of a highly two-dimensional behavior of macroscopic fluctuations of vortex-antivortex depairing type. The role of defects or inhomogeneities in the resistive behavior is outlined. © 1995.