Title :
Voltage-current characteristics and noise properties of SNS junctions
Author :
Flett, A. ; Colclough, M.S. ; He, Y. ; Muirhead, C.M. ; Robinson, R.A. ; Char, K.
Author_Institution :
Birmingham Univ., UK
fDate :
6/1/1995 12:00:00 AM
Abstract :
We report measurements of V/I/B characteristics for a number of YBCO/N/YBCO junctions where the N layer is Co doped YBCO. The field dependence of about half the junctions tested showed I/sub c//B characteristics which approached 100% modulation for T>80K far field directions both perpendicular to the plane of the junction and along the width of the junction. Other junctions showed an anomalous field modulation which decreased as the temperature was increased. More detailed measurements are reported for one junction which showed fairly large modulation. The V/I characteristics were found to be in very good agreement with a thermally rounded RSJ model in the temperature range 74-80 K. The voltage noise peaked at I/sub c/, and had a 1/f dependence in the range measured. It had a value of 8 nV Hz/sup -1/2/ at 1 Hz and 75 K.<>
Keywords :
1/f noise; Josephson effect; barium compounds; high-temperature superconductors; superconducting device noise; yttrium compounds; 1 Hz; 1/f noise; 74 to 80 K; SNS junctions; YBCO/Co doped YBCO/YBCO junctions; YBaCuO-YBaCuO:Co-YBaCuO; critical current; magnetic field; thermally rounded RSJ model; voltage noise; voltage-current characteristics; Fabrication; Integrated circuit noise; Integrated circuit testing; Magnetic field measurement; Magnetic separation; Noise measurement; Temperature distribution; Voltage; Yttrium barium copper oxide;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
