2 AFM image of the terraced (001) STO substrate (upper panel); typical profile of the substrate (middle panel); 2 AFM image of the LSMO buffer layer, LSMO grain width corresponds to the STO terrace width, as shown by the dotted lines (lower panel).
scans of the single YBCO film deposited on the STO substrate and of the YBCO/LSMO bi-layer. (00l) peaks correspond to the epitaxial YBCO films.
-scans around the (002) reflections of the two YBCO films (circles) and the corresponding simulations (lines).
Magnetization curves of the single YBCO film (open circles), the LSMO/YBCO bi-layer (open squares) measured at 70 K, and their corresponding fits (solid lines).
Magnetic field dependence of the critical current density, , as deduced from Eq. (1), at 10, 40, and 70 K.
Temperature dependence of the irreversibility field, , of the two YBCO samples.
f(h) dependencies at different temperatures for (a) the single YBCO film and (b) for the YBCO layer deposited on the LSMO buffer (open symbols). Scaling law fit (solid lines), Eq. (2), of f(h) for (a) the single YBCO film at 50 K and (b) for the buffered YBCO film for all the studied temperatures.
Scaling law, Eq. (2), parameter p evolution as a function of temperature for the two YBCO films.
variation in an applied external field of 3.5 T for the two YBCO films; (inset) , see Eq. (3), calculated at different temperatures for an applied field of 3.5 T.
Schematic presentation of the origin of , three-dimensional AFM image of the LSMO buffer layer surface, which, at saturation, may correspond to that of the magnetic vortex pinning potential, , within the YBCO film deposited on top.
Article metrics loading...
Full text loading...