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Influence of growth temperature on critical current and magnetic flux pinning structures in
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View: Figures


Image of FIG. 1.
FIG. 1.

(Color online) The self-field (, ), for , for , and α are presented as a function of the growth temperature . The data are plotted on a log scale.

Image of FIG. 2.
FIG. 2.

(Color online) is presented for the films of this work grown at different temperatures but all with . For the films grown at 730, 790, and , was measured at , while for the remaining films was measured at .

Image of FIG. 3.
FIG. 3.

(Color online) Cross-sectional TEM [(a) and (b)] and plan-view SEM [(c) and (d)] from films with different . (a) . The inset shows high resolutions images of the Y124 intergrowths, identified by their lattice spacing. (b) . The inset shows high resolutions images of the Y–Cu–O nanocolumns, likely . (c) . The film surface is rather porous with a few -axis grains and is largely free of second phases. (d) . The film surface is dense with a large number of second phases. Energy dispersive x-ray spectroscopy revealed that the rectangular second phases seen in the image are Ba rich.

Image of FIG. 4.
FIG. 4.

(Color online) for two films grown at with different . The film grown at was deposited at . The inset shows a schematic of a portion of the Ba–Cu–O phase diagram. The horizontal dashed line represents the of used in this work, and the solid arrow indicates the direction of increasing . The dashed arrow represents the direction of increasing . In pulsed laser deposition at high (such as ), the source material tends to coalesce in the plume before reaching the substrate, and these larger masses will not grow epitaxially. Scanning electron microscopy (not shown) revealed that this greatly contributed to the lower of the film grown with by reducing the effective current carrying cross section.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Influence of growth temperature on critical current and magnetic flux pinning structures in YBa2Cu3O7−x