Critical current density and microstructure of YBa[sub 2]Cu[sub 3]O[sub 7] thin films post-annealed at a low oxygen partial pressure

Journal Article · Wed Apr 01 00:00:00 EST 1992 · Journal of Superconductivity; (United States)

DOI:https://doi.org/10.1007/BF00618058· OSTI ID:7205493

Mogro-Campero, A; Turner, L G; Hall, E L ^[1]

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1. GE Research and Development Center, Schenectady, NY (United States)

Post-annealing of thin films of YBa[sub 2]Cu[sub 3]O[sub 7] (YBCO) has been performed at 29 Pa and 750[degrees]C. For films 0.6 [mu]m thick, a critical current density >1 MA cm[sup [minus]2] is obtained at 77 K, with a sharp eddy current response at 25 MHz. Microstructural investigation of these films by cross-sectional and planar transmission electron microscopy reveals that the YBCO film has the c-axis normal to the plane of the substrate in a continuous sheet of varying thickness, frequently covering the entire thickness of the film. Mutually perpendicular rods with the c-axis in the plane of the LaAlO[sub 3] substrate are also seen. The microstructure and critical current density of these films are compared with those of previously reported films post-annealed in atmospheric pressure oxygen. 7 refs., 4 figs.

• OSTI ID: 7205493
• Journal Information: Journal of Superconductivity; (United States), Vol. 5:2; ISSN 0896-1107
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
HIGH-TC SUPERCONDUCTORS
ANNEALING
CRITICAL CURRENT
MICROSTRUCTURE
OXYGEN
PARTIAL PRESSURE
ALUMINIUM COMPOUNDS
BARIUM COMPOUNDS
COPPER COMPOUNDS
EDDY CURRENTS
LANTHANUM COMPOUNDS
OXIDES
THIN FILMS
TRANSMISSION ELECTRON MICROSCOPY
YTTRIUM COMPOUNDS
ALKALINE EARTH METAL COMPOUNDS
CHALCOGENIDES
CURRENTS
ELECTRIC CURRENTS
ELECTRON MICROSCOPY
ELEMENTS
FILMS
HEAT TREATMENTS
MICROSCOPY
NONMETALS
OXYGEN COMPOUNDS
RARE EARTH COMPOUNDS
SUPERCONDUCTORS
TRANSITION ELEMENT COMPOUNDS
360207* - Ceramics
Cermets
& Refractories- Superconducting Properties- (1992-)
360204 - Ceramics
Cermets
& Refractories- Physical Properties
360202 - Ceramics
Cermets
& Refractories- Structure & Phase Studies