Persistent photoconductivity in high T{sub c} grain boundary Josephson junctions

Journal Article · Thu May 01 04:00:00 EDT 1997 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.118856· OSTI ID:496347

Hoffmann, A; Schuller, I K ^[1]; Gilabert, A; Medici, M G ^[2]; Schmidl, F; Seidel, P ^[3]

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1. Physics Department 0319, University of California--San Diego, La Jolla, California 92093-0319 (United States)
2. University of Nice Sophia Antipolis, URA CNRS 190, Parc Valrose, 06108 Nice Cedex (France)
3. Institut fuer Festkoerperphysik, Friedrich-Schiller-Universitaet Jena, Helmholtzweg 5, D-07743 Jena (Germany)

We observed persistent photoconductivity in YBa{sub 2}Cu{sub 3}O{sub x} 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 YBa{sub 2}Cu{sub 3}O{sub x}. A comparison with the persistent photoconductivity in oxygen depleted YBa{sub 2}Cu{sub 3}O{sub x} thin films implies an average oxygen content of x=6.6{plus_minus}0.1 for the grain boundary. The spectral dependence has a lower threshold for persistent photoconductivity in the junctions ({approx}1.2 eV) than in thin films. {copyright} {ital 1997 American Institute of Physics.}

• OSTI ID: 496347
• Journal Information: Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 18 Vol. 70; ISSN 0003-6951; ISSN APPLAB
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
66 PHYSICS
BARIUM COMPOUNDS
BARIUM OXIDES
BICRYSTALS
COPPER OXIDES
GRAIN BOUNDARIES
HIGH-TC SUPERCONDUCTORS
JOSEPHSON EFFECT
JOSEPHSON JUNCTIONS
PHOTOCONDUCTIVITY
STOICHIOMETRY
THIN FILMS
YTTRIUM COMPOUNDS
YTTRIUM OXIDES