Transport critical current density and electrical characterization of patterned high- T sub c superconducting thin films prepared by metallo-organic decomposition

Journal Article · Sun Jul 15 00:00:00 EDT 1990 · Journal of Applied Physics; (USA)

DOI:https://doi.org/10.1063/1.346799· OSTI ID:6728828

Lubberts, G ^[1]

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1. Corporate Research Laboratories, Eastman Kodak Company, Rochester, New York 14650-2011 (USA)

Resistivity and transport critical current density have been measured as a function of temperature for patterned YBa{sub 2}Cu{sub 3}O{sub 7}{sub {minus}{delta}} and Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8}{sub +{delta}} superconducting thin films on single-crystal (100)-oriented MgO substrates. These granular superconducting films were prepared by the metallo-organic decomposition method. Transition temperatures {ital T}{sub {ital c}} ({rho}=0) are around 72 K for YBa{sub 2}Cu{sub 3}O{sub 7} and 82 K for Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8} films, both 1 {mu}m in thickness. Critical current densities approaching 10{sup 5} A/cm{sup 2} have been measured in the Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8} films at low temperatures. The critical current densities in YBa{sub 2}Cu{sub 3}O{sub 7} films are about 40 times lower than those in the Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8} films. It was found that near {ital T}{sub {ital c}} the critical current density in both films is proportional to ({ital T}{sub {ital c}}{minus}{ital T}){sup 2}, in agreement with a superconductor--normal-metal-- superconductor model developed by DeGennes (P. G. De Gennes, Rev. Mod. Phys. {bold 36}, 225 (1964)). The reason for the much higher current density in the Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8} film is believed to be due to the stronger coupling between the superconducting grains.

• OSTI ID: 6728828
• Journal Information: Journal of Applied Physics; (USA), Journal Name: Journal of Applied Physics; (USA) Vol. 68:2; ISSN 0021-8979; ISSN JAPIA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
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
BISMUTH COMPOUNDS
BISMUTH OXIDES
CALCIUM COMPOUNDS
CALCIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
CRITICAL CURRENT
CRYSTALS
CURRENTS
ELECTRIC CONDUCTIVITY
ELECTRIC CURRENTS
ELECTRICAL PROPERTIES
FILMS
GRANULAR MATERIALS
HIGH-TC SUPERCONDUCTORS
MAGNESIUM COMPOUNDS
MAGNESIUM OXIDES
MATERIALS
MONOCRYSTALS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
STRONTIUM COMPOUNDS
STRONTIUM OXIDES
SUBSTRATES
SUPERCONDUCTING FILMS
SUPERCONDUCTORS
TEMPERATURE DEPENDENCE
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE
YTTRIUM COMPOUNDS
YTTRIUM OXIDES