Superconductivity in molybdenum/tantalum superlattices and yttrium-barium-copper-oxide thin films
Thesis/Dissertation
·
OSTI ID:5946949
The properties of sputter-deposited multilayered superconductors have been studied, including Mo/Ta metallic superlattices and thin films of YBa{sub 2}Cu{sub 3}O{sub 7-x}. The former have been prepared with the same integer number of atomic planes of Mo and Ta modulating the layered composition. In contrast to behavior observed in other metal-metal superlattices, Mo/Ta exhibits long range structural coherence and metallic resistivity behavior over the entire range of wavelengths down to the monolayer limit. The structural properties of these superlattices are used to explain an anomalous decrease in the c{sub 44} elastic stiffness constant previously observed in Mo/Ta for 20 {angstrom} {le} {Lambda} {le} 50 {angstrom}. Superconductivity measurements indicate universal {Tc} versus {rho} behavior in Mo/Ta, and tunneling results show that these superlattices are weakly-coupled BCS superconductors. The second part of this dissertation examines the properties of superconducting thin films of YBa{sub 2}Cu{sub 3}O{sub 7-x} prepared by dc triode sputtering from metallic targets of Y and Ba{sub 2}Cu{sub 3}. Post-depression annealing in O{sub 2} is necessary to form the superconducting oxide. Various substrates were used, including sapphire and MgO, both with and without buffer layers of Ag, and SrTiO{sub 3}. The buffer layers are used to decrease the interaction of the substrate with the film.
- Research Organization:
- Arizona Univ., Tucson, AZ (USA)
- OSTI ID:
- 5946949
- Country of Publication:
- United States
- Language:
- English
Similar Records
Superconducting superlattice structures. [Mo/Ta; YBa/sub 2/Cu/sub 3/O/sub x/]
Progress in high-temperature superconducting transistors and other devices; Proceedings of the SPIE Meeting, Vol. 1394, Santa Clara, CA, Oct. 4, 5, 1990
Sputter deposition of YBa sub 2 Cu sub 3 O sub 7 minus x films on Si at 500 degree C with conducting metallic oxide as a buffer layer
Conference
·
Wed Dec 31 23:00:00 EST 1986
·
OSTI ID:5556847
Progress in high-temperature superconducting transistors and other devices; Proceedings of the SPIE Meeting, Vol. 1394, Santa Clara, CA, Oct. 4, 5, 1990
Conference
·
Mon Dec 31 23:00:00 EST 1990
·
OSTI ID:5680034
Sputter deposition of YBa sub 2 Cu sub 3 O sub 7 minus x films on Si at 500 degree C with conducting metallic oxide as a buffer layer
Journal Article
·
Mon Jul 16 00:00:00 EDT 1990
· Applied Physics Letters; (USA)
·
OSTI ID:7073923
Related Subjects
36 MATERIALS SCIENCE
360104* -- Metals & Alloys-- Physical Properties
360204 -- Ceramics
Cermets
& Refractories-- Physical Properties
656100 -- Condensed Matter Physics-- Superconductivity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
DATA ANALYSIS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
FILMS
HIGH-TC SUPERCONDUCTORS
MEASURING METHODS
MOLYBDENUM COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
REFRACTORY METAL COMPOUNDS
SPUTTERING
STRUCTURAL CHEMICAL ANALYSIS
SUPERCONDUCTIVITY
SUPERCONDUCTORS
SUPERLATTICES
TANTALUM COMPOUNDS
THIN FILMS
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
YTTRIUM OXIDES
360104* -- Metals & Alloys-- Physical Properties
360204 -- Ceramics
Cermets
& Refractories-- Physical Properties
656100 -- Condensed Matter Physics-- Superconductivity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
DATA ANALYSIS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
FILMS
HIGH-TC SUPERCONDUCTORS
MEASURING METHODS
MOLYBDENUM COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
REFRACTORY METAL COMPOUNDS
SPUTTERING
STRUCTURAL CHEMICAL ANALYSIS
SUPERCONDUCTIVITY
SUPERCONDUCTORS
SUPERLATTICES
TANTALUM COMPOUNDS
THIN FILMS
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
YTTRIUM OXIDES