Title :
Properties of YBaCuO step-edge Josephson junction series arrays
Author :
Konopka, J. ; Wolff, I. ; Beuven, S. ; Siegel, M. ; Braginski, A.I.
Author_Institution :
Inst. fur Mobil- und Satellitenfunktechnik, Kamp Lintfort, Germany
fDate :
6/1/1995 12:00:00 AM
Abstract :
YBa/sub 2/Cu/sub 3/O/sub 7/ (YBCO) structures composed of 10 and 100 step-edge Josephson junction series arrays incorporated into two-arm logarithmic spiral or bow-tie type were designed, fabricated by pulsed-laser deposition on structured LaAlO/sub 3/ substrates and measured in the temperature range 12 to 70 K at frequencies up to 150 GHz. At 18 K the I/sub c/R/sub N/ product of 10 junction arrays was up to 0.8 mV. Wide Shapiro steps at voltages corresponding to the multiple frequency of irradiation of 100 and 150 GHz were measured, as well as the emitted power and the linewidth at 12 GHz. In some arrays, 30 to 40% of the junctions were phase locked. This indicated that the spread of critical parameters of that fraction of the total junction population did not exceed 10%.<>
Keywords :
Josephson effect; barium compounds; high-temperature superconductors; pulsed laser deposition; yttrium compounds; 100 to 150 GHz; 12 to 70 K; LaAlO/sub 3/; LaAlO/sub 3/ substrates; Shapiro steps; YBCO; YBa/sub 2/Cu/sub 3/O/sub 7/; bow-tie; critical current normal resistance product; phase locking; pulsed-laser deposition; step-edge Josephson junction series arrays; two-arm logarithmic spiral; Frequency measurement; Josephson junctions; Phased arrays; Power measurement; Pulse measurements; Spirals; Temperature distribution; Temperature measurement; Voltage; Yttrium barium copper oxide;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
