Regensburg 2004 – wissenschaftliches Programm
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TT: Tiefe Temperaturen
TT 31: Supraleitung: Vortexdynamik, Vortexphasen, Pinning
TT 31.8: Vortrag
Freitag, 12. März 2004, 12:00–12:15, H20
Advanced manipulation of substrates for growth induced pinning in YBCO thin films — •S. Brück1, J. Albrecht1,2, S. Leonhardt2, R. Spolenak1, G. Cristiani2, H.–U. Habermeier2, and G. Schütz1 — 1Max-Planck-Institut für Metallforschung, Heisenbergstr. 3, D-70569 Stuttgart — 2Max-Planck-Institut für Festkörperforschung, Heisenbergstr. 1, D-70569 Stuttgart
One way to enhance flux pinning and thus the critical current density in YBCO thin films is by modifying the substrates’ surface topography [1,2]. Irradiation with a focused beam of gallium ions (FIB) creates dot-like structures which induce pinning sites in the superconductor during film growth. To enhance the density of these structures it is necessary to prevent surface charging, which can be achieved by using substrates with a higher conductivity. We show AFM images of the microstructures and quantitative magnetooptical measurements of YBCO thin films grown on such sophisticated substrates. It is found, that the critical current density can be enhanced substantially by lateral size reduction of the created structures.
[1] S. Leonhardt, J. Albrecht, R. Warthmann, H.-U. Habermeier and H. Kronmüller, Physica C 341-348, 1979-1980 (2000)
[2] J. Albrecht, S. Leonhardt, H.-U. Habermeier, S. Brück, R. Spolenak and H. Kronmüller, Physica C, in Press