Journal
APPLIED PHYSICS LETTERS
Volume 96, Issue 14, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3371814
Keywords
barium compounds; cobalt; critical current density (superconductivity); grain boundaries; iron compounds; Josephson effect; metallic epitaxial layers; superconducting junction devices
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Funding
- New Energy and Industrial Technology Development Organization (NEDO), Japan
- Funding Program for World- Leading Innovative R&D on Science and Technology, Japan
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Josephson junctions were fabricated in epitaxial films of cobalt-doped BaFe2As2 on [001]-tilt (La,Sr)(Al,Ta)O-3 bicrystal substrates. 10-mu m-wide microbridges spanning a 30 degrees-tilted bicrystal grain boundary (BGB bridge) exhibited resistively-shunted-junction (RSJ)-like current-voltage characteristics up to 17 K, and the critical current was suppressed remarkably by a magnetic field. Microbridges without a BGB did not show the RSJ-like behavior, and their critical current densities were 20 times larger than those of BGB bridges, confirming BGB bridges display a Josephson effect originating from weakly-linked BGB.
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