Spatial variation of the current in grain boundary Josephson junctions

M. Carmody*, B. H. Moeckly, K. L. Merkle, L. D. Marks

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

9 Scopus citations


The spatial variation of the current across the boundary in several YBa 2 Cu 3 O 7-x grain boundary Josephson junctions was determined using direct methods. A phase retrieval algorithm was used to calculate the positional critical current density J(x) from critical current versus applied magnetic field, I c (B), measurements. The current distributions were highly nonuniform along the length of the junctions. These measurements are consistent with existing filamentary grain boundary models, low temperature scanning microscopy studies, and laser scanning microscopy studies of high T c grain boundaries. The very large scatter in the critical currents reported in the literature for grain boundaries of the same macroscopic geometry appear to be due to the underlying variations in local critical currents.

Original languageEnglish (US)
Pages (from-to)2454-2459
Number of pages6
JournalJournal of Applied Physics
Issue number5
StatePublished - Mar 2000

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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