Title :
Characteristics of noises in high-temperature YBCO Josephson junctions
Author :
Horng, H.E. ; Yang, S.Y. ; Jeng, J.T. ; Wu, J.M. ; Chen, J.H. ; Yang, H.C.
Author_Institution :
Dept. of Phys., Nat. Taiwan Univ., Taipei, Taiwan
fDate :
6/1/1999 12:00:00 AM
Abstract :
In this work, the characteristics of the noises for high-temperature YBCO Josephson junctions and SQUIDs were studied. The noise power spectrum densities showed complicated behaviors, which may be attributed to many causes. In order to realize the contributions of these causes to the noise, the noise power spectra were detected at various bias currents. Thus, the noises owing to the critical current fluctuation, resistance fluctuation or apparent flux motion can be investigated. By comparing these noise power spectra under the different conditions, the origins of the noises for the junctions and SQUIDs can be clarified.
Keywords :
Josephson effect; SQUIDs; barium compounds; high-temperature superconductors; superconducting device noise; yttrium compounds; Josephson junction; SQUID; YBCO; YBaCuO; critical current fluctuation; flux motion; high temperature superconductor; noise power spectrum; resistance fluctuation; Critical current; Fluctuations; Josephson junctions; Low-frequency noise; Physics; SQUIDs; Superconducting coils; Superconducting device noise; Voltage; Yttrium barium copper oxide;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
