Magnetooptical investigations of large transport currents in Y-Ba-Cu-O-thin films

Inhomogeneities in large area YBCO-thin films can be studied in external magnetic fields with a specially designed magnetooptical apparatus. Moreover, an investigation of transport current induced magnetic fields in patterned HTS-thin films is possible as well. In the present work we studied the flu...

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Bibliographic Details
Published in:IEEE transactions on applied superconductivity 2001-03, Vol.11 (1), p.3178-3181
Main Authors: Kuhn, M., Heinrich, A., Schey, B., Biegel, W., Numssen, K., Kinder, H., Stritzker, B.
Format: Article
Language:English
Subjects:
Bridges
Bridges (structures)
Condensed matter: electronic structure, electrical, magnetic, and optical properties
COPPER OXIDE
Current distribution
Exact sciences and technology
Flux
FLUXES
Geometry
High-tc films
Inhomogeneities
MAGNETIC FIELD
Magnetic field measurement
Magnetic fields
Magnetic films
Magnetooptic effects
Magnetooptical effects
Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation
Optical properties of bulk materials and thin films
PENETRATION
Physics
Superconducting epitaxial layers
Superconducting films and low-dimensional structures
SUPERCONDUCTIVITY
SUPERCONDUCTORS
THIN FILMS
Transistors
Transport
Yttrium barium copper oxide
YTTRIUM OXIDE
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Summary:Inhomogeneities in large area YBCO-thin films can be studied in external magnetic fields with a specially designed magnetooptical apparatus. Moreover, an investigation of transport current induced magnetic fields in patterned HTS-thin films is possible as well. In the present work we studied the flux penetration of the current induced fields into YBCO-bridges of 8/spl times/0.7 cm/sup 2/ dimensions as a function of the applied currents at 77 K. For the first time transport currents up to I/sub tr//spl sim/60 A could be investigated magnetooptically in HTS-thin films. Flux penetration starts just above a threshold value of the applied current I/sub tr//I/sub c//spl ges/0.3. The influence of the bridge geometry and of inhomogeneities on flux penetration has been investigated. Flux and therefore current distributions change drastically with increasing bend-angle of the YBCO-path. A magnetic interaction between adjacent bridges with parallel and antiparallel current directions as well as a thermal interaction could be observed.
ISSN:1051-8223
1558-2515
DOI:10.1109/77.919738