High critical current density ultrathin YBa sub 2 Cu sub 3 O sub x films made by a modified rf-magnetron sputtering technique

Journal Article · Thu Mar 01 04:00:00 EST 1990 · Journal of Applied Physics; (USA)

DOI:https://doi.org/10.1063/1.345503· OSTI ID:6986180

Gao, J; Haeuser, B; Rogalla, H ^[1]

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1. Low Temperature Division, Faculty of Applied Physics, University of Twente, 7500 AE Enschede, The Netherlands (NL)

High-quality {cflx {ital c}}-axis oriented thin films have been grown {ital in} {ital situ} on (100) surfaces of ZrO{sub 2} , SrTiO{sub 3} , and MgO. Sharp transitions to superconductivity were observed with {ital T}{sub {ital c},off} of 87--89.5 K for films thicker than 70 A. The critical current density at 77.3 K was found to be strongly dependent on the film thickness. A maximum value was found for a 100-A film with 8{times}10{sup 6} A/cm{sup 2} at 77.3 K. On atomically flat single-crystal MgO substrates, films as thin as 15 A revealed a full transition to superconductivity above 45.5 K. The superconducting properties of the films turned out to be quite insensitive to the deposition parameters, such as substrate temperature, oxygen partial pressure, sputter power, etc.

• OSTI ID: 6986180
• Journal Information: Journal of Applied Physics; (USA), Journal Name: Journal of Applied Physics; (USA) Vol. 67:5; 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
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
CRITICAL CURRENT
CURRENTS
ELECTRIC CURRENTS
FILMS
MAGNESIUM COMPOUNDS
MAGNESIUM OXIDES
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
SPUTTERING
STRONTIUM COMPOUNDS
SUBSTRATES
THERMODYNAMIC PROPERTIES
TITANATES
TITANIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE
YTTRIUM COMPOUNDS
YTTRIUM OXIDES
ZIRCONIUM COMPOUNDS
ZIRCONIUM OXIDES