ac susceptibility and critical-current densities in sintered YBa2Cu3O7−δ superconductors

ac susceptibility and critical-current densities in sintered YBa2Cu3O7−δ superconductors

The field-amplitude and frequency dependent complex ac susceptibility of a well sinteredYBa2Cu3O7−δ disk has been measured at 77K, which shows that its intra- and intergranular critical-current densities are determined by the collective flux creep inside the grains and the maximum Josephsoncurrents...

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Bibliographische Detailangaben
Hauptverfasser: Chen, Du-Xing, Sánchez Moreno, Álvaro, Pardo Vivé, Enric, Bartolomé Porcar, María Elena, American Physical Society
Format: Artikel
Sprache:eng
Schlagworte:
Creep
Critical currents
Flux creep
High temperature superconductivity
Josephson effect
Josephson junctions
Rotating flows
Sintering
Superconductivity models
Superconductors
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Zusammenfassung:The field-amplitude and frequency dependent complex ac susceptibility of a well sinteredYBa2Cu3O7−δ disk has been measured at 77K, which shows that its intra- and intergranular critical-current densities are determined by the collective flux creep inside the grains and the maximum Josephsoncurrents across the grain boundaries, respectively. While the former is widely recognized, the latter contrasts to a popular belief of a mechanism of Josephson-vortex pinning and creep.