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Type: Artigo de periódico
Title: Josephson coupling between superconducting clusters in Bi2Sr2CaCu2O8-delta crystals
Author: de Lima, OF
Awana, VPS
Ribeiro, RA
Avila, MA
Abstract: Diamagnetic moments for two Bi2Sr2CaCu2O8+delta crystals were measured at different fields H and temperatures. For the higher fields two distinct transition temperatures T-g and T-J are seen, with T-g > T-J. By increasing H the line T-g(H) shifts very slowly while T-J(H) shifts much faster to lower temperatures, displaying a clear upward curvature well described by a theory based on Josephson coupling between superconducting clusters. We show further that T-J(H) is dependent on sample homogeneity, which is correlated with oxygen distribution in the high-T-c superconductors.
Country: França
Editor: E D P Sciences
Rights: aberto
Date Issue: 2000
Appears in Collections:Unicamp - Artigos e Outros Documentos

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