Josephson Bicrystal Junctions on Sapphire Substrates for THz Frequency Application

Thin film metal oxide superconducting bicrystal junctions on sapphire substrates with I c R N products up to 2.5 mV at 4.2 K for width 4 mum and normal-state junction resistance 10-60 Omega were fabricated and characterized at dc and THz frequency. Three types of samples-one with broadband log-perio...

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Bibliographic Details
Published in:Journal of superconductivity and novel magnetism 2006-11, Vol.19 (7-8), p.669-673
Main Authors: Ovsyannikov, G. A., Borisenko, I. V., Constantinian, K. Y., Kislinski, Y. V., Hakhoumian, A., Pogosyan, N. G., Zakaryan, T. V.
Format: Article
Language:English
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Summary:Thin film metal oxide superconducting bicrystal junctions on sapphire substrates with I c R N products up to 2.5 mV at 4.2 K for width 4 mum and normal-state junction resistance 10-60 Omega were fabricated and characterized at dc and THz frequency. Three types of samples-one with broadband log-periodic antenna, another with double-slot antenna for 300 GHz and third one with double-slot antenna for 400 GHz-have been investigated at THz frequency. New design of antenna coupling with Josephson junction was elaborated for minimization of THz frequency losses in superconducting film. For a particular case of f=320 GHz double-slot antenna, a ratio for bandwidth Q = f/Deltaf {approximately equal to} 10 was measured.
ISSN:1557-1939
1557-1947
DOI:10.1007/s10948-006-0130-6