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Weak-link behavior of grain boundaries in superconducting bicrystals
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View: Figures


Image of FIG. 1.
FIG. 1.

TEM micrograph of a cross section of the GB region in a 24° [001] tilt Ba-122 film which confirms that the grains are epitaxial and c-axis oriented. The HRTEM image (a) is viewed parallel to the GB in longitudinal section parallel to the (001) planes. The (001) planes are well aligned across the GB. A lower magnification image from a region with a single grain orientation (b) shows that the film is of uniform thickness. The selected area diffraction pattern of the Ba-122 film along the [010] zone axis is shown in (c) together with the corresponding SAD pattern for the substrate (d). The SAD patterns show that the Ba-122 film is single-crystal, c-axis oriented, and epitaxially related to the substrate.

Image of FIG. 2.
FIG. 2.

Irreversibility field and upper critical field defined by the 10% and 90% points of on resistance curves across a 6° [001] tilt GB and its neighboring grain with field applied perpendicular to the film. Inset: resistive transitions up to 35 T across the GB.

Image of FIG. 3.
FIG. 3.

(a) LTLSM image scanned in steps of a 6° [001] tilt bicrystal taken at 12 K and 0.25 T with bias current of 39 mA which generated across the bridge. It shows a 2D map of induced by transport current along the bridge across the GB. E is enhanced by a factor of 23 at the GB as compared to the intragranular E. (b) MO image of a 9° bicrystal with computed streamlines (yellow) of the magnetization current calculated from the Bean model (Ref. 27). The MO image was taken after cooling to 6 K in a perpendicular field of 120 mT and then reducing the field to zero.

Image of FIG. 4.
FIG. 4.

Dependence of the critical current density across GBs (12 K, 0.5 T) as a function of the misorientation angle . The inset shows summary data from Ref. 1 for YBCO GBs.

Image of FIG. 5.
FIG. 5.

Comparative field dependencies of the critical current density across GB and in the grains for (a) 6° and (b) 24° bicrystals at 12, 14, and 16 K. The gap between and diminishes as the field increases.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Weak-link behavior of grain boundaries in superconducting Ba(Fe1−xCox)2As2 bicrystals