Accession Number:

ADA229082

Title:

High Temperature Superconducting Compounds

Descriptive Note:

Final technical rept. 1 Sep 1987-30 Sep 1990,

Corporate Author:

MINNESOTA UNIV ST PAUL

Report Date:

1990-10-01

Pagination or Media Count:

12.0

Abstract:

High-Tc superconductors have been investigated in both bulk and thin film form. A technique for the in-situ preparation of high-Tc superconducting films involving the use of ozone-assisted Molecular Beam Expitaxy has been developed. The procedures seem be to generalized to the extent that high quality trilayer and multilayer structures which would be useful scientifically and technologically are possible. In addition to the process working with the usual substrates, it has been possible to deposit films on Si substrates without any buffer layer. A bolometer has been successfully fabricated on a thermally isolated SiN substrate coated with YSZ. Very thin and transparent films with relatively high transition temperatures have been prepared. The magnetic properties of bulk polycrystalline and single crystal high temperature superconductors have been measured and reveal important features of flux pinning and anistropy in these materials. A low temperature scanning tunneling microscope for the investigation of the surfaces of high-Tc superconductors has been developed. js

Subject Categories:

  • Electrical and Electronic Equipment

Distribution Statement:

APPROVED FOR PUBLIC RELEASE