Persistent photoconductivity in high Tc grain boundary Josephson junctions

A. Hoffmann, Ivan K. Schuller, A. Gilabert, M. G. Medici, F. Schmidl, P. Seidel

Research output: Contribution to journalArticlepeer-review


We observed persistent photoconductivity in YBa2Cu3Ox bicrystal grain boundary Josephson junctions. Upon illumination of these grain boundary Josephson junctions, the normal state resistance decreases and the critical current increases. This strongly suggests that the grain boundary in these films consists of oxygen depleted YBa2Cu3Ox. A comparison with the persistent photoconductivity in oxygen depleted YBa2Cu3Ox thin films implies an average oxygen content of x=6.6±0.1 for the grain boundary. The spectral dependence has a lower threshold for persistent photoconductivity in the junctions (≈1.2 eV) than in thin films.

Original languageEnglish (US)
Pages (from-to)2461-2463
Number of pages3
JournalApplied Physics Letters
Issue number18
StatePublished - May 5 1997
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)


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