Ion beam controllable modification of YBa sub 2 Cu sub 3 O sub 7 minus x superconducting thin films

Journal Article · Sat Jun 01 04:00:00 EDT 1991 · Journal of Applied Physics; (USA)

DOI:https://doi.org/10.1063/1.347481· OSTI ID:5691584

Li, Y; Ren, C; Chen, G; Chen, J; Zou, S ^[1]

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1. Ion Beam Laboratory, Shanghai Institute of Metallurgy, Academia Sinica, Shanghai 200050, People's Republic of China (CN)

The superconducting transport properties of high-quality epitaxial YBa{sub 2}Cu{sub 3}O{sub 7{minus}{ital x}} thin films have been controllably modified using Ar{sup +} ion implantation. It was found that both the critical current density {ital J}{sub {ital c}} and the superconducting transition temperature {ital T}{sub {ital c}} significantly decreased with fluence. However, when {ital J}{sub {ital c}} (at 77 K, {ital H}=0) decreased by six orders of magnitude, {ital T}{sub {ital c}} only decreased from 89 to 77.5 K. A fluence of 5{times}10{sup 12} Ar/cm{sup 2} was sufficient to reduce {ital J}{sub {ital c}} near zero, but {ital T}{sub {ital c}} still remained above 77 K. We have observed the structure and the morphology of the sample using x-ray diffraction and high-resolution transmission electron microscopy. A film irradiated with Ar{sup +} ions became semiconductor at a bombardment fluence of about 1.2{times}10{sup 13} Ar/cm{sup 2}, while its superconducting state completely disappeared for an Ar{sup +} dose of about 2.2{times}10{sup 13} Ar/cm{sup 2}. An Ar{sup +} fluence of 5{times}10{sup 14} Ar/cm{sup 2} made the sample amorphous with so high resistivity that it could be treated as insulator. The experimental results showed the possibility of fabricating Josephson junction devices from YBa{sub 2}Cu{sub 3}O{sub 7{minus}{ital x}} superconducting thin films and patterning this kind of films by ion implantation technique.

• OSTI ID: 5691584
• Journal Information: Journal of Applied Physics; (USA), Journal Name: Journal of Applied Physics; (USA) Vol. 69:11; ISSN 0021-8979; ISSN JAPIA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360204 -- Ceramics
Cermets
& Refractories-- Physical Properties
360206* -- Ceramics
Cermets
& Refractories-- Radiation Effects
656100 -- Condensed Matter Physics-- Superconductivity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALKALINE EARTH METAL COMPOUNDS
ARGON IONS
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
CHARGED PARTICLES
COPPER COMPOUNDS
COPPER OXIDES
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
FILMS
HIGH-TC SUPERCONDUCTORS
ION IMPLANTATION
IONS
JOSEPHSON JUNCTIONS
JUNCTIONS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
SUPERCONDUCTING FILMS
SUPERCONDUCTING JUNCTIONS
SUPERCONDUCTIVITY
SUPERCONDUCTORS
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE
YTTRIUM COMPOUNDS
YTTRIUM OXIDES