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Superconducting screening on different length scales in high-quality bulk superconductor
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View: Figures


Image of FIG. 1.
FIG. 1.

Field dependence of for a bulk sample at .

Image of FIG. 2.
FIG. 2.

Field dependence of the relative decrease of with field, , for the same sample as in Fig. 1 at .

Image of FIG. 3.
FIG. 3.

Temperature dependence of the transition field for several different samples: HIP-ed with volume of (open squares) and (solid squares), commercial powder with particle size less than (solid circles), which was subsequently ground to obtain particles smaller than (open circles).

Image of FIG. 4.
FIG. 4.

The dependence of the transition field on the volume of the HIP-ed sample, for , 20 and . extrapolates to zero at for all three temperatures.

Image of FIG. 5.
FIG. 5.

The dependence of the transition field on the sample length, for the core of an iron-sheathed wire. The diameter of the core was constant, . Inset: The dependence of on the diameter of the core for an iron-sheathed wire, where the length of the core was kept constant, at . The temperature was .

Image of FIG. 6.
FIG. 6.

The dependence of the transition field on the volume of the HIP-ed , for , 20 and .

Image of FIG. 7.
FIG. 7.

Magnetooptical image for a HIP-ed sample at . The bar represents .

Image of FIG. 8.
FIG. 8.

Optical image for the same HIP-ed sample as in Fig. 7. The bar represents .

Image of FIG. 9.
FIG. 9.

Schematic drawing of the screening currents in the sample. and are drawn by solid and dotted lines, respectively. The screening currents on lengthscale are represented by the dots. The shaded ellipses are the voids in the sample.

Image of FIG. 10.
FIG. 10.

The field dependence of for the HIP-ed sample with volume of , at . Solid line is the fit using Eq. (3), with , , , , and . Solid and dotted lines show separately the first and second part of the Eq. (3), respectively. Solid squares are calculated in the critical state model, with values of obtained from the transport measurements, for an iron-sheathed wire at .

Image of FIG. 11.
FIG. 11.

Scanning electron microscope image of a HIP-ed sample at two different magnifications. The sample was broken off a larger pellet, without polishing, to reveal the finer structure of clusters in the cells.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Superconducting screening on different length scales in high-quality bulk MgB2 superconductor