Accession Number:

ADA179134

Title:

Superconducting Electronic Film Structures.

Descriptive Note:

Annual rept. 1 Jan-31 Dec 86,

Corporate Author:

WESTINGHOUSE RESEARCH AND DEVELOPMENT CENTER PITTSBURGH PA

Personal Author(s):

Report Date:

1987-01-20

Pagination or Media Count:

24.0

Abstract:

Bulk samples of the newly discovered La-Sr-Cu-O Superconductors have been made which have critical onset temperatures over 38 K. The greater effectiveness of impurities oxygen compared to epitaxy for the stabilization of stoichiometric A15 Nb-Ge was demonstrated. The positive effect of oxides on the formation of A15 Nb-A1 was also shown. Experiments involving the deliberate addition of a contaminant methane during barrier deposition provided a major advance in the understanding of the processes required for producing high quality NbN-MgO-NbN junctions. A model for predicting the orientation of single crystal Nb and Nb-Sn films on sapphire was experimentally verified. Results were obtained which indicate that epitaxy is essential for NbN-Mg-NbN trilayer processing if the junction is to be operated above 4.2 K.

Subject Categories:

  • Solid State Physics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE