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The displacement and annihilation of macroscopic regions with hypervortices in ceramic
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View: Figures


Image of FIG. 1.
FIG. 1.

Layout of a ceramic plate with locally frozen field in a region of diameter , which can be displaced by distance under the action of the Lorenz force ( is the frozen vortex current, and FG is a probe coil).

Image of FIG. 2.
FIG. 2.

Curves of the FMF distribution close to the surface of a ceramic sample along the axis of a ceramic plate (see Fig. 1). The curve corresponding to the initial FMF before current passed through the sample is designated as , and the other curves were recorded after currents equal to , , and passed through the sample. The last curve corresponds to the residual part of the FMF, which was displaced virtually not at all. The fact that the scattering field is recorded along the entire length of the sample and not only in the freezing region with a diameter of about is explained by the spatial elongation of the scattering field of the source of the FMF and by the elongated probe-coil detector in a direction perpendicular to the plane of the sample.

Image of FIG. 3.
FIG. 3.

Variation of the FMF distribution above two regions with hypervortices of different direction (antihypervortices) along the axis of a ceramic plate (shown in the inset) after a transport current of magnitude 2, 3, 3.5, briefly passes through the plate ( is the initial distance between the extrema).

Image of FIG. 4.
FIG. 4.

Dependences of the transport current needed to bring two antihypervortices together by and the extrema of the magnetic field distribution of the antihypervortices as a function of the distance between them. The upper part of the figure shows diagrams of antihypervortices approaching each other as increases.

Image of FIG. 5.
FIG. 5.

The absolute value of an FMF above the epicenter of three regions of a ceramic (1, 2, 3) with a critical current density of , located along the axis of the sample at a distance from each other of , vs the short-term transport current imposed and directed perpendicular to the axis through the sample. The differences in the dependences are associated with inhomogeneity of the ceramic over the area of the sample.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: The displacement and annihilation of macroscopic regions with hypervortices in ceramic YBa2Cu3O7−x