Enhanced critical currents by high-pressure impregnation of 1-2-3 systems with normal conductors

Ugur Ortabasi; J. H.P. Watson; James A. Black

doi:10.1117/12.20888

1 October 1990 Enhanced critical currents by high-pressure impregnation of 1-2-3 systems with normal conductors

Ugur Ortabasi, J. H.P. Watson, James A. Black

Proceedings Volume 1287, High Tc Superconductivity: Thin Films and Applications; (1990) https://doi.org/10.1117/12.20888
Event: Advances in Semiconductors and Superconductors: Physics Toward Devices Applications, 1990, San Diego, CA, United States

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.

Citation Download Citation

Ugur Ortabasi, J. H.P. Watson, and James A. Black "Enhanced critical currents by high-pressure impregnation of 1-2-3 systems with normal conductors", Proc. SPIE 1287, High Tc Superconductivity: Thin Films and Applications, (1 October 1990); https://doi.org/10.1117/12.20888

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available