Weak Link Array Junctions in EuBa2Cu3O7-x Films for Microwave Detection

Koji TSURU  Osamu MICHIKAMI  

Publication
IEICE TRANSACTIONS on Electronics   Vol.E77-C   No.8   pp.1224-1228
Publication Date: 1994/08/25
Online ISSN: 
DOI: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Section on Superconducting Devices)
Category: HTS
Keyword: 
superconducting device,  grain boundary,  weak link,  array junction,  bicrystal substrate,  microwave detection,  

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Summary: 
High temperature superconductors are eminently suitable for use in high frequency devices because of their large energy gap. We fabricated weak link Josephson junctions connected in series. The junctions were constructed of EuBa2Cu3O7-x (EBCO) superconducting thin films on bicrystal MgO substrates. We measured their microwave broadband detection (video detection) characteristics. The responsivity (Sr) of the junctions depended on the bias current and their normal state resistance. The array junctions were effective in increasing normal state resistance. We obtained a maximum Sr of 22.6 [V/W].