Accession Number : ADA259692

Title :   High Temperature Superconductivity.

Descriptive Note : Quarterly rept. for period ending 30 Sep 92,

Corporate Author : VARIAN ASSOCIATES INC PALO ALTO CA

Personal Author(s) : Eckstein, James N.

Report Date : 11 DEC 1992

Pagination or Media Count : 4

Abstract : The overall goals of this program are to develop the technology of MBE (Molecular Beam Epitaxy), growth of HTSC (High temperature superconductors) material, to optimize the performance of HTSC films with high transition temperatures and critical current densities, and to explore the development of electronic devices based on such material. During this period work focussed on learning how to grow the 123-phase semiconductor by atomic layering. The atomic absorption system was used to measure Dy and Ba fluxes. The absorbance of Dy is somewhat low, by utilizing careful measurement techniques sufficiently precise measurements were obtained. Growth of the 123-phase under conditions similar to those used for growth of the Bi-family superconductors gave smooth surfaces and sharp transitions with a zero resistance temperature of more than 89 K.

Descriptors :   *SUPERCONDUCTIVITY, *HIGH TEMPERATURE, MOLECULAR BEAMS, EPITAXIAL GROWTH, FILMS, CURRENT DENSITY, MATERIALS, ELECTRONICS, ATOMIC PROPERTIES, LAYERS, DYSPROSIUM, BARIUM, FLUX(RATE), ABSORPTION, BISMUTH, TRANSITIONS, SURFACES, RESISTANCE, TEMPERATURE, JOSEPHSON JUNCTIONS.

Subject Categories : Electricity and Magnetism
      Thermodynamics
      Crystallography

Distribution Statement : APPROVED FOR PUBLIC RELEASE