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Influence of Fe buffer thickness on the crystalline quality and the transport properties of bilayers
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View: Figures


Image of FIG. 1.
FIG. 1.

The representative microstructure of the well-textured Fe/Ba-122 bilayer . The Co-doped Ba-122 layer is clean and no appreciable defects are observed. The figure has been digitally stitched together from three separate images acquired under the same conditions in order to present a larger area of the film.

Image of FIG. 2.
FIG. 2.

-scans of Fe/Ba-122 bilayers with and 15 nm on (001) MgO substrates in Bragg–Brentano geometry using radiation. No secondary phase was observed, proving a high phase purity. However, additional 110 and 220 peaks of Co-doped Ba-122 were observed for the bilayer with .

Image of FIG. 3.
FIG. 3.

(a) Resistivity traces for the Fe/Ba-122 bilayers with different . The respective of Fe/Ba-122 with and 4 nm were 23.1 and 20.2 K. (b) Transport for of the bilayers with and 15 nm at a reduced temperature of .

Image of FIG. 4.
FIG. 4.

characteristics of the Fe/Ba-122 bilayer at different temperatures. The field was applied parallel (a) and perpendicular to the -axis (b). Normalized pinning force, , as a function of reduced field for (c) and (d) . The black lines in both figures are calculated with the Kramer model for the aim of comparison.

Image of FIG. 5.
FIG. 5.

(a) of the Fe/Ba-122 bilayer measured under several magnetic fields at 10 K. No additional peaks except at were observed. The solid lines represent the random pinning contribution. (b) All data can be scaled with an anisotropy parameter of ranging 1.4–2.1 at given temperatures except for the angular range close to . The recalculated from pinning force scaling described in Fig. 4 was also plotted (solid lines). The values were observed to decrease with decreasing temperature, as shown in the inset, which shows the same behavior as Co-doped Ba-122 on bare LSAT (see Ref. 3). This temperature dependence of is an evidence for multiband superconductivity.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Influence of Fe buffer thickness on the crystalline quality and the transport properties of Fe/Ba(Fe1−xCox)2As2 bilayers