Structures in superconducting YBa2Cu3O7-delta thin films investigated by magneto-optic technique

Autor(en): Eisenmenger, J
Kambach, S
Saleh, S
Tihi, A
Leiderer, P
Wallenhorst, M
Dotsch, H
Stichwörter: FLUX DISTRIBUTION; Physics; Physics, Applied; Physics, Condensed Matter
Erscheinungsdatum: 1996
Herausgeber: PLENUM PUBL CORP
Journal: JOURNAL OF LOW TEMPERATURE PHYSICS
Volumen: 105
Ausgabe: 5-6
Startseite: 1123
Seitenende: 1128
Zusammenfassung: 
Using a reflection magneto-optic technique we have investigated natural inhomogeneities and artificial structures in YBCO thin films exposed to an external magnetic field. The artificial structures were mechanically scratched by scanning a diamond tip with different loading over the film surface. Alternatively planar structures with reduced oxygen content could be patterned by heating the YBCO film with a focused laser beam in nitrogen atmosphere. Depending on the laser annealing parameters different screening properties concerning the applied magnetic field could be achieved. As a magneto-optically active layer we used EuS films evaporated on glass as well as bismuth- and gallium-doped lutetium-iron-garnet films grown onto (111) oriented gadolinium-gallium-garnet substrates by liquid phase epitaxy. In contrast to measurements with EuS films that show only weak fara day rotation for temperatures higher than 20 K the magneto-optic studies have been expanded to about 60 K by using the garnet films.
Beschreibung: 
International Conference on Physics and Chemistry of Molecular and Oxide Superconductors, KARLSRUHE, GERMANY, AUG 02-06, 1996
ISSN: 00222291
DOI: 10.1007/BF00753850

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