Title :
Detecting properties of YBaCuO thin film bridges
Author :
Tavkhelidze, A.N. ; Kuzmin, L.S. ; Soldatov, E.S. ; Okhrimenco, V.N. ; Kovalev, A.S. ; Seleznev, B.V. ; Pirogov, V.G.
Author_Institution :
Moscow State Univ., USSR
fDate :
3/1/1991 12:00:00 AM
Abstract :
A study is made of the properties of YBaCuO superconducting microbridges. They were fabricated by both direct photolithographic techniques and focused laser beam patterning. The YBaCuO thin films were deposited onto ZrO2, MgO, and SrTiO3 substrates by laser ablation of a massive YBaCuO target. The Josephson effect was observed in the bridges by detecting Shapiro steps and selective responses under irradiation with a signal frequency of 27-36 GHz. The value of the product IcRN reached 4.5 MV at T=4.2 K and 420 μV at T=77 K. The best values for wideband sensitivity η(T) and noise-equivalent power NEP(T) were η(77)=5×103 V/W NEP(77)=2×10-12 W/Hz1/2 η(20)=2.5×106 V/W, and NEP(20)=10-14 W/Hz1/2. The estimation of noise by the width of the selective response shows than the internal noise is 1.5-2.5 times higher than the thermal value
Keywords :
Josephson effect; barium compounds; electric sensing devices; electron device noise; high-temperature superconductors; microwave detectors; solid-state microwave devices; superconducting junction devices; superconducting thin films; yttrium compounds; 27 to 36 GHz; 4.2 to 77 K; EHF; Josephson effect; MM-wave detector; Shapiro steps detection; YBaCuO thin film bridges; YBaCuO-MgO; YBaCuO-SrTiO3; YBaCuO-ZrO2; direct photolithographic techniques; focused laser beam patterning; high temperature superconductors; internal noise; massive YBaCuO target; microwave irradiation; millimetre wave detector; superconducting microbridges; Bridges; Josephson effect; Laser ablation; Laser beams; Sputtering; Substrates; Superconducting device noise; Superconducting thin films; Transistors; Yttrium barium copper oxide;
Journal_Title :
Magnetics, IEEE Transactions on
