Growth and characterization of Y-Ba-Cu-O high- Tc superconductor thin films

Thesis/Dissertation · Tue Jan 01 04:00:00 EST 1991

OSTI ID:7202999

Kittl, J A

Two types of growth processes of Y-Ba-Cu-O thin films were investigated: three-step processes involving post-deposition high-temperature anneals, and in-situ growth processes. Films were deposited by sequential ion beam sputtering from elemental Y, Ba and Cu targets, and characterized by various methods. In the three-step process, multilayers of {approximately}60 {angstrom} periodicity were deposited on (001) SrTiO{sub 3}, annealed in oxygen at 850-900C, and subsequently at 400-500C, to obtain the superconducting YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} phase. The films were epitaxial, predominantly single phase, with different orientations. The in-situ growth of YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} films by sequential ion beam sputtering was investigated. The films were deposited following the stacking sequence, with the individual layer thicknesses nominally equal to one monolayer, at temperatures between 550 and 750C. O{sub 2} was supplied during growth. Epitaxial, c-axis oriented films were obtained on MgO and SrTiO{sub 3}. The correlations between deposition parameters, and structural and electrical properties were investigated. The films had expanded c-axis lattice parameters. The superconducting transition temperatures decreased with the enlargement of the c-lattice parameter.

• Research Organization: California Inst. of Tech., Pasadena, CA (United States)
• OSTI ID: 7202999
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360201* -- Ceramics
Cermets
& Refractories-- Preparation & Fabrication
360202 -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
360204 -- Ceramics
Cermets
& Refractories-- Physical Properties
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
BEAMS
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
CORRELATIONS
CRYSTAL STRUCTURE
DEPOSITION
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ENERGY BEAM DEPOSITION
FILMS
HIGH-TC SUPERCONDUCTORS
ION BEAMS
LATTICE PARAMETERS
MAGNESIUM COMPOUNDS
MAGNESIUM OXIDES
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
SPUTTERING
STRONTIUM COMPOUNDS
STRONTIUM OXIDES
SUBSTRATES
SUPERCONDUCTING FILMS
SUPERCONDUCTIVITY
SUPERCONDUCTORS
SURFACE COATING
THERMODYNAMIC PROPERTIES
TITANIUM COMPOUNDS
TITANIUM OXIDES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE
YTTRIUM COMPOUNDS
YTTRIUM OXIDES