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Science 25 February 1994:
Vol. 263. no. 5150, pp. 1112 - 1114
DOI: 10.1126/science.263.5150.1112
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Articles

Spatially Resolved Observation of Static Magnetic Flux States in YBa2Cu3O7-dgr Grain Boundary Josephson Junctions

G. M. Fischer 1, B. Mayer 1, R. Gross 1, T. Nissel 1, K. -D. Husemann 1, R. P. Huebener 1, T. Freltoft 2, Y. Shen 2, and P. Vase 2

1 Physikalisches Institut, Lehrstuhl Experimentalphysik II, Universität Tübingen, Morgenstelle 14, D-72076 Tübingen, Germany
2 NKT Research Center, DK-2605 Brøndby, Denmark

With low-temperature scanning electron microscopy, the magnetic flux states in high critical temperature Josephson junctions have been imaged. The experiments were performed with YBa2Cu3O7-dgr thin-film grain boundary Josephson junctions fabricated on [001] tilt SrTiO3 bicrystals. For applied magnetic fields parallel to the grain boundary plane, which correspond to local maxima of the magnetic field dependence of the critical current, the images clearly show the corresponding magnetic flux states in the grain boundary junction. The spatial modulation of the Josephson current density by the external magnetic field is imaged directly with a spatial resolution of about 1 micrometer.

Submitted on October 18, 1993
Accepted on December 7, 1993

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Science. ISSN 0036-8075 (print), 1095-9203 (online)