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

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9 Author(s)
A. I. Golovashkin ; Lebedev Inst. of Phys., Acad. of Sci., Moscow, USSR ; A. L. Gudkov ; S. I. Krasnosvobodtsev ; L. S. Kuzmin
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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 SrTiO3 and LiNbO3 substrates by laser sputtering of ceramic targets. Values of critical current Ic and normal resistance Rn of the weak links could be altered by plasma etching of the structures. IcR n products up to 100 μV 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

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IEEE Transactions on Magnetics  (Volume:25 ,  Issue: 2 )