Title :
Josephson effect and macroscopic quantum interference in high-T c superconducting thin-film weak links at 77 K
Author :
Golovashkin, A.I. ; Gudkov, A.L. ; Krasnosvobodtsev, S.I. ; Kuzmin, L.S. ; Likharev, K.K. ; Maslennikov, Yu.V. ; Pashkin, Yu A. ; Pechen, E.V. ; Snigirev, O.V.
Author_Institution :
Lebedev Inst. of Phys., Acad. of Sci., Moscow, USSR
fDate :
3/1/1989 12:00:00 AM
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 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
Keywords :
Josephson effect; barium compounds; high-temperature superconductors; sputtered coatings; superconducting junction devices; superconducting thin films; yttrium compounds; 77 K; Dayem microbridges; Josephson effect; LiNbO3; Shapiro steps; SrTiO3; YBa2Cu3Oy; ceramic targets; critical current; double microbridge structures; high temperature superconductor; laser sputtering; macroscopic quantum interference; microwave radiation; normal resistance; photolithography; plasma etching; superconducting thin-film weak links; Ceramics; Copper; Critical current; Interference; Josephson effect; Lithography; SQUIDs; Sputtering; Superconducting microwave devices; Superconducting thin films;
Journal_Title :
Magnetics, IEEE Transactions on
