Grain boundary Josephson devices by YBaCuO films and 77K operations

Conference · Wed Mar 01 04:00:00 EST 1989 · IEEE Trans. Magn.; (United States)

OSTI ID:6044356

Yamashita, T; Kawakami, A; Noge, S; Xu, W; Takata, M; Komatsu, T; Matusita, K

Magnetron sputtering and screen printing methods were used to fabricate YBaCuO films with thickness of 5 to 30..mu..m. The annealing of the films at 1000/sup 0/C gave abnormal grain growth. The grain size of the films was about 20 to 70..mu..m. With photolithography and razor cutting techniques, the films were formed to bridge type Josephson junctions having a few grain boundaries in the bridge regions. In the devices, clear Shapiro steps and SQUID patterns were observed at 77K. The experiments show that all currents flowing through grain boundaries are Josephson currents in YBaCuO polycrystalline films. Clear Josephson effects were observed in about 30% of the fabricated devices. The device may hae high potentials for high frequency detectors and SQUID flux sensors operative at 77K.

• Research Organization: Dept. of Electronics, and Dept. of Chemistry, Nagaoka Univ. of Technology, 1603-1, kamitomoika, Nagaoka, Niigata, 940-21 (JP)
• OSTI ID: 6044356
• Report Number(s): CONF-880812-
• Conference Information: Journal Name: IEEE Trans. Magn.; (United States) Journal Volume: 25:2
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
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Cermets
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656003 -- Condensed Matter Physics-- Interactions between Beams & Condensed Matter-- (1987-)
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71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
CRYSTAL STRUCTURE
CRYSTALS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELECTRONIC EQUIPMENT
EQUIPMENT
FABRICATION
FILMS
FLUXMETERS
GRAIN BOUNDARIES
JOSEPHSON JUNCTIONS
JUNCTIONS
MAGNETIC FLUX
MAGNETOMETERS
MEASURING INSTRUMENTS
MICROSTRUCTURE
MICROWAVE EQUIPMENT
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
POLYCRYSTALS
SQUID DEVICES
SUPERCONDUCTING DEVICES
SUPERCONDUCTING FILMS
SUPERCONDUCTING JUNCTIONS
SUPERCONDUCTIVITY
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
YTTRIUM OXIDES