Spatially resolved observation of static magnetic flux states in YBa[sub 2]Cu[sub 3]O[sub 7[minus][delta]] grain boundary Josephson junctions

Journal Article · Fri Feb 25 04:00:00 EST 1994 · Science (Washington, D.C.); (United States)

DOI:https://doi.org/10.1126/science.263.5150.1112· OSTI ID:6982406

Fisher, G M; Mayer, B; Gross, R; Nissel, T; Husemann, K D; Huebener, R P ^[1]; Freltoft, T; Shen, Y; Vase, P ^[2]

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1. Universitaet Tuebingen (Germany)
2. NKT Research Center, Brondby (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 YBa[sub 2]Cu[sub 3]O[sub 7[minus][delta]] thin-film grain boundary Josephson junctions fabricated on [001] tilt SrTiO[sub 3] 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 a spatial resolution of about 1 micrometer.

• OSTI ID: 6982406
• Journal Information: Science (Washington, D.C.); (United States), Journal Name: Science (Washington, D.C.); (United States) Vol. 263:5150; ISSN SCIEAS; ISSN 0036-8075
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
ELECTRON MICROSCOPY
GRAIN BOUNDARIES
HIGH-TC SUPERCONDUCTORS
JOSEPHSON JUNCTIONS
JUNCTIONS
MAGNETIC FLUX
MICROSCOPY
MICROSTRUCTURE
SCANNING ELECTRON MICROSCOPY
SUPERCONDUCTING JUNCTIONS
SUPERCONDUCTORS