Flux penetration into flat rectangular superconductors with anisotropic critical current
- Max-Planck-Institut fuer Metallforschung, Postfach 800665, D-70506 Stuttgart (Germany)
- Hahn-Meitner-Institut, Postfach 390128, D-14091 Berlin (Germany)
Superconductors with anisotropic critical-current density j{sub c} exhibit characteristic anisotropic flux-density patterns during penetration of magnetic flux. We investigate this anisotropic flux penetration in detail by observations using the magneto-optical Faraday effect and by first-principles calculations which describe the superconductor as a nonlinear anisotropic conductor. Our samples are thin plates of DyBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} into which anisotropic pinning is introduced by oblique irradiation with 340-MeV Xe ions creating linear defects. Excellent agreement between experiment and theory is obtained. In particular, we find that in rectangular plates with j{sub c} anisotropy equal to the side ratio, the intrinsic and shape anisotropies may {ital compensate} such that the flux pattern looks like that in an isotropic square stretched to the rectangular shape. This means the current streamlines are concentric rectangles which shrink to a point rather than to a line, and the discontinuity lines where the current bends sharply, coincide with the diagonals of the rectangle rather than forming the usual double-Y structure. {copyright} {ital 1997} {ital The American Physical Society}
- OSTI ID:
- 528107
- Journal Information:
- Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 6 Vol. 56; ISSN 0163-1829; ISSN PRBMDO
- Country of Publication:
- United States
- Language:
- English
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