Accession Number : ADA193123

Title :   Superconducting Thin Films, Composites and Junctions.

Descriptive Note : Final rept. 1 May 87-31 Oct 87,

Corporate Author : STANFORD UNIV CA DEPT OF APPLIED PHYSICS

Personal Author(s) : Geballe, T H

PDF Url : ADA193123

Report Date : 25 Nov 1987

Pagination or Media Count : 9

Abstract : The successful synthesis of high-Tc YBa2Cu3O7 films by means of electron beam codeposition has been accomplished. Several important growth parameters have been surveyed in a preliminary way. The substrates investigated include Al2O3, ZrO2, MgO and SrTiO3. The films were characterized by resistivity measurements, X-ray diffraction, microprobe, and Rutherford backscattering analysis. Some TEM and critical current density studies were also carried out. The best results to date have been obtained on SrTiO3 substrates with which polycrystalline epitaxial growth has been achieved. Resistive superconducting transitions with zero resistance at 89.5K and a 2K width have been observed in these films. Keywords: Thin films; Superconductivity; Vapor deposition; Single crystal films; Small scale Calorimetry, Structures, Metastable phases, Oxides.

Descriptors :   *SUPERCONDUCTIVITY, *SUPERCONDUCTORS, *THIN FILMS, BACKSCATTERING, CALORIMETRY, CURRENT DENSITY, DEPOSITION, ELECTRON BEAMS, EPITAXIAL GROWTH, MEASUREMENT, METASTABLE STATE, OXIDES, PARAMETERS, POLYCRYSTALLINE, SINGLE CRYSTALS, SUBSTRATES, TRANSITIONS, VAPOR DEPOSITION, X RAY DIFFRACTION, ELECTRICAL RESISTANCE, YTTRIUM, BARIUM, COPPER COMPOUNDS, OXIDES, TITANIUM OXIDES, STRONTIUM, PEROVSKITES

Subject Categories : Electricity and Magnetism

Distribution Statement : APPROVED FOR PUBLIC RELEASE