Focused Ion Beam Fabrication of Single Grain Bi sub 2 Sr sub 2 Ca sub 1 Cu sub 2 O sub x Submicron Bridges

Superconducting microbridges have been patterned by direct milling of the Bi sub 2 Sr sub 2 Ca sub 1 Cu sub 2 O sub x polycrystalline thin films using focused ion beam. Several single grain and multigrain bridges of sizes as small as 0.3 mu m have been fabricated. Single grain microbridges exhibit a...

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Bibliographic Details
Published in:Applied physics letters 1991-08, Vol.59 (6), p.727-729
Main Authors: Zitkovsky, I D, Hu, Q, Orlando, T P, Melngailis, J, Tao, T
Format: Article
Language:English
Subjects:
360204 > Ceramics, Cermets, & Refractories-- Physical Properties
ALKALINE EARTH METAL COMPOUNDS
BEAMS
BISMUTH COMPOUNDS
BISMUTH OXIDES
CALCIUM COMPOUNDS
CALCIUM OXIDES
CHALCOGENIDES
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
COPPER COMPOUNDS
COPPER OXIDES
CRITICAL CURRENT
CURRENTS
ELECTRIC CURRENTS
FABRICATION
ION BEAMS
JUNCTIONS
MAGNETIC FLUX
MATERIALS SCIENCE
OXIDES
OXYGEN COMPOUNDS
STRONTIUM COMPOUNDS
STRONTIUM OXIDES
SUPERCONDUCTING FILMS
SUPERCONDUCTING JUNCTIONS
TEMPERATURE DEPENDENCE
TRANSITION ELEMENT COMPOUNDS 426001 > Engineering-- Superconducting Devices & Circuits-- (1990-)
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Summary:Superconducting microbridges have been patterned by direct milling of the Bi sub 2 Sr sub 2 Ca sub 1 Cu sub 2 O sub x polycrystalline thin films using focused ion beam. Several single grain and multigrain bridges of sizes as small as 0.3 mu m have been fabricated. Single grain microbridges exhibit a linear temperature dependence of the critical current density with J sub c = 10 exp 6 A/cm exp 2 at 8K, and zero magnetic field. Larger 50-100 mu m bridges show lower critical current densities of J sub c = 10 exp 4 -10 exp 5 A/cm exp 2 . The current--voltage (I--V) and the J sub c vs. T characteristics show two qualitatively different types of superconducting weak links. The single grain microbridges behave as homogeneous superconductors with transport exhibiting flux creep and flux flow. The large bridges can be characterized as granular superconductors with weaky connected grains, and their I--V and the J sub c vs. T characteristics are dependent on processing conditions. Photomicrographs, Graphs. 15 ref.--AA
ISSN:0003-6951
1077-3118
DOI:10.1063/1.105353