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Josephson effect and macroscopic quantum interference in high-T/sub c/ superconducting thin-film weak links at 77 K

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  • A. I. Golovashkin
  • A. L. Gudkov
  • S. I. Krasnosvobodtsev
  • L. S. Kuzmin
  • K. K. Likharev
  • Y. V. Maslennikov
  • Y. A. Pashkin
  • E. V. Pechen
  • O. V. Snigirev
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<mark>Journal publication date</mark>1989
<mark>Journal</mark>IEEE Transactions on Magnetics
Issue number2
Volume25
Number of pages3
Pages (from-to)943-945
Publication statusPublished
Original languageEnglish

Abstract

The authors studied the properties of single and double superconducting weak links (Dayem microbridges) fabricated by direct photolithography from thin films of 1-2-3 copper oxides, deposited on SrTiO/sub 3/ and LiNbO/sub 3/ substrates by laser sputtering of ceramic targets. Values of critical current I/sub c/ and normal resistance R/sub n/ of the weak links could be altered by plasma etching of the structures. I/sub c/R/sub n/ products up to 100 mu V were achieved, and well-pronounced Shapiro steps under 8-GHz microwave radiation were observed at 77 K. Macroscopic quantum interference was clearly registered in double microbridge structures at the same temperature.