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Flux pinning and vortex dynamics in high Tc superconducting films

✍ Scribed by V.G. Prokhorov; G.G. Kaminsky; Ya.A. Petrukhno; A.L. Kasatkin; M.A. Kuznetsov; V.M. Pan

Publisher
Elsevier Science
Year
1993
Tongue
English
Weight
520 KB
Volume
33
Category
Article
ISSN
0011-2275

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✦ Synopsis

The field dependences of the critical current, current-voltage characteristics and a.c. susceptibility have been investigated for superconducting YBa2Cu307 films prepared by laser ablation. It was shown that the flux line pinning in polycrystalline high Tc films occurs due to anisotropy of the superconducting parameters in the case of strong misorientation of adjacent grains and that it is connected with local suppression of the order parameter for smaller misorientation angles. Peculiarities of the resistive state in magnetic fields have led us to suppose that vortex motion occurs preferably along the grain boundaries, which form a network of so-called easy slip channels. Such microstructural features of the tested films lead to the double-peak behaviour of the dissipative part of the a.c. susceptibility.

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Critical currents and flux pinning in Ag
Critical currents and flux pinning in Ag stabilized high Tc superconductor wires
✍ J. Tenbrink; K. Heine; H. Krauth πŸ“‚ Article πŸ“… 1990 πŸ› Elsevier Science 🌐 English βš– 530 KB

Y1Ba2Cu307\_x and Bi2Sr2CalCu208+ x Ag sheathed high Tc superconductor wires have been prepared using the powder in tube technique. Characterization of wire specimens was performed mainly by measuring critical current densities at 77 K and 4.2 K, as well as by a.c. susceptibility measurements. Where