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Formation of nanosized precipitates and their contribution to flux pinning in Ir-doped quasi-multilayers
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View: Figures


Image of FIG. 1.
FIG. 1.

scans of a YBCO sample and two Ir-doped samples measured with . The main difference between them is the additional peaks at 25.1° and 51.2°. The doped samples show a slightly higher amount of . STO: (001), (002), and (003) of the substrate, : Reflexions due to radiation.

Image of FIG. 2.
FIG. 2.

Dependence of critical temperature (a), content (b), content (c), and -axis lattice parameter (d) on Ir pulse number for the 40 layer series. Whereas content and lattice parameter increase linearly with pulse number, there is no significant trend seen for the content. falls only by .

Image of FIG. 3.
FIG. 3.

(Color online) Texture measurement of YBCO and particles of the five-pulse Ir-doped film (outer line: 10% of maximum). The particles grow mostly epitaxially in cube-on-cube relationship inside the film. Only a few weak spots of two other orientations are visible.

Image of FIG. 4.
FIG. 4.

(Color online) AFM images of a YBCO sample (a) and a two-pulse Ir-doped sample. Both samples show a large number of precipitates and some pinholes, both slightly increased in the doped sample. The doped sample shows precipitates in the nanometer range (see inset of size). These were concluded to be the particles.

Image of FIG. 5.
FIG. 5.

Comparison of the critical current densities for at between the five-pulse Ir-doped sample with a standard YBCO film. A strong increase in pinning force density (inset) and, hence, is seen.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Formation of nanosized BaIrO3 precipitates and their contribution to flux pinning in Ir-doped YBa2Cu3O7−δ quasi-multilayers