Observation of strong to Josephson-coupled crossover in 10° YBa2Cu3Ox bicrystal junctions

A temperature-dependent strong to weak (Josephson) coupling crossover near 75 K is observed for 10° misorientation YBa2Cu3Ox grain boundaries. Below 75 K the current–voltage characteristic (IVC) shows strongly coupled, flux-flow behavior. Above 75 K, the IVC is Josephson coupled. The data are consis...

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Veröffentlicht in:Applied physics letters 1999-11, Vol.75 (20), p.3171-3173
Hauptverfasser: Redwing, R. D., Hinaus, B. M., Rzchowski, M. S., Heinig, N. F., Davidson, B. A., Nordman, J. E.
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Sprache:eng
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Zusammenfassung:A temperature-dependent strong to weak (Josephson) coupling crossover near 75 K is observed for 10° misorientation YBa2Cu3Ox grain boundaries. Below 75 K the current–voltage characteristic (IVC) shows strongly coupled, flux-flow behavior. Above 75 K, the IVC is Josephson coupled. The data are consistent with a network of microbridges at the grain boundary defined by dislocation strain fields. The data are compared to recent calculations by A. Gurevich and A. E. Pashitskii [Phys. Rev. B 57, 13878 (1998)]. The characteristic voltages for these low-angle grain boundaries are higher than high-angle boundaries at 77 K, and could lead to improved high-temperature superconducting device operation in this temperature range.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.125267