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Proceedings Paper

Enhanced critical currents by high-pressure impregnation of 1-2-3 systems with normal conductors
Author(s): Ugur Ortabasi; J. H.P. Watson; James A. Black
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Paper Abstract

In this paper we present the preliminary analytical and experimental results of a novel low temperature metal impregnation method to increase the critical currents in thick film and bulk HTSC materials. The method described results in a structurally more controllable and effective microcomposite than the ones obtained with metal- and metal-oxide precursors. The physical procedure involves the infiltration of the interstices of the porous, fully treated superconductor with low-melting point, low T superconductor under high pressure. Deep penetration of the metal into the granular superconducting matrix creates large surface areas of strong Proximity Effect. Improved intergrain coupling increases the DC Josephson current and therefore J, the critical current. Prior to the experimental work a theoretical study was conducted. Indium was chosen as the impregnation material. Computations showed.that the infiltrated system should have at least a four orders higher critical current (4.47 x 104 A/cm2) as compared to the same array with vacuum barriers of 20A thickness between the grains (0.31 A/cm2). On the experimental side, high T, porous, 1-2-3 samples impregnated with gallium exhibited very low contact resistance (2. 1 x 10-6 cm2) at 85°K, a value about two orders of magnitude better than the 1-2-3 systems containing intergranular silver. Further experiments with indium impregnated samples are planned. This new low temperature method allows the manufacture of highly flexible wires and films when used with suitable substrates.

Paper Details

Date Published: 1 October 1990
PDF: 14 pages
Proc. SPIE 1287, High Tc Superconductivity: Thin Films and Applications, (1 October 1990); doi: 10.1117/12.20888
Show Author Affiliations
Ugur Ortabasi, SPARTA, Inc. (United States)
J. H.P. Watson, Univ. of Southampton (United Kingdom)
James A. Black, SPARTA Inc. (United States)

Published in SPIE Proceedings Vol. 1287:
High Tc Superconductivity: Thin Films and Applications
Cheng-Chung John Chi; R. Bruce van Dover, Editor(s)

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